diff --git a/libs/libyuv/include/libyuv/planar_functions.h b/libs/libyuv/include/libyuv/planar_functions.h
index 5299fe2c0e..50fe5f681d 100644
--- a/libs/libyuv/include/libyuv/planar_functions.h
+++ b/libs/libyuv/include/libyuv/planar_functions.h
@@ -582,7 +582,7 @@ typedef void (*ARGBBlendRow)(const uint8_t* src_argb0,
 
 // Get function to Alpha Blend ARGB pixels and store to destination.
 LIBYUV_API
-ARGBBlendRow GetARGBBlend();
+ARGBBlendRow GetARGBBlend(void);
 
 // Alpha Blend ARGB images and store to destination.
 // Source is pre-multiplied by alpha using ARGBAttenuate.
diff --git a/libs/libyuv/source/planar_functions.cc b/libs/libyuv/source/planar_functions.cc
index 5a9d56d88a..c07f0943d3 100644
--- a/libs/libyuv/source/planar_functions.cc
+++ b/libs/libyuv/source/planar_functions.cc
@@ -1185,7 +1185,7 @@ int ARGBMirror(const uint8_t* src_argb,
 // As there are 6 blenders to choose from, the caller should try to use
 // the same blend function for all pixels if possible.
 LIBYUV_API
-ARGBBlendRow GetARGBBlend() {
+ARGBBlendRow GetARGBBlend(void) {
   void (*ARGBBlendRow)(const uint8_t* src_argb, const uint8_t* src_argb1,
                        uint8_t* dst_argb, int width) = ARGBBlendRow_C;
 #if defined(HAS_ARGBBLENDROW_SSSE3)
diff --git a/src/fs_encode.c b/src/fs_encode.c
index 235a5d9f11..527dc3eeff 100644
--- a/src/fs_encode.c
+++ b/src/fs_encode.c
@@ -46,7 +46,7 @@
 #pragma warning (disable:167)
 #endif
 
-static void fs_encode_cleanup()
+static void fs_encode_cleanup(void)
 {
 	switch_safe_free(SWITCH_GLOBAL_dirs.conf_dir);
 	switch_safe_free(SWITCH_GLOBAL_dirs.mod_dir);
diff --git a/src/fs_tts.c b/src/fs_tts.c
index 2a963ee68e..6632e86566 100644
--- a/src/fs_tts.c
+++ b/src/fs_tts.c
@@ -46,7 +46,7 @@
 #pragma warning (disable:167)
 #endif
 
-static void fs_tts_cleanup()
+static void fs_tts_cleanup(void)
 {
 	switch_safe_free(SWITCH_GLOBAL_dirs.conf_dir);
 	switch_safe_free(SWITCH_GLOBAL_dirs.mod_dir);
diff --git a/src/mod/applications/mod_av/avcodec.c b/src/mod/applications/mod_av/avcodec.c
index a9f6d0927e..b4eaeadd2e 100644
--- a/src/mod/applications/mod_av/avcodec.c
+++ b/src/mod/applications/mod_av/avcodec.c
@@ -2208,7 +2208,7 @@ static void parse_codecs(avcodec_profile_t *aprofile, switch_xml_t codecs)
 }
 
 
-static void load_config()
+static void load_config(void)
 {
 	switch_xml_t cfg = NULL, xml = NULL;
 
diff --git a/src/mod/applications/mod_av/avformat.c b/src/mod/applications/mod_av/avformat.c
index 1f767d0bde..d52e141b6b 100644
--- a/src/mod/applications/mod_av/avformat.c
+++ b/src/mod/applications/mod_av/avformat.c
@@ -2861,7 +2861,7 @@ static char *supported_formats[SWITCH_MAX_CODECS] = { 0 };
 
 static const char modname[] = "mod_av";
 
-static switch_status_t load_config()
+static switch_status_t load_config(void)
 {
 	char *cf = "avformat.conf";
 	switch_xml_t cfg, xml, param, settings;
diff --git a/src/mod/applications/mod_conference/conference_loop.c b/src/mod/applications/mod_conference/conference_loop.c
index f6c2856892..8f112f5453 100644
--- a/src/mod/applications/mod_conference/conference_loop.c
+++ b/src/mod/applications/mod_conference/conference_loop.c
@@ -75,7 +75,7 @@ struct _mapping control_mappings[] = {
 	{"deaf off", conference_loop_deaf_off}
 };
 
-int conference_loop_mapping_len()
+int conference_loop_mapping_len(void)
 {
 	return (sizeof(control_mappings)/sizeof(control_mappings[0]));
 }
diff --git a/src/mod/applications/mod_conference/mod_conference.h b/src/mod/applications/mod_conference/mod_conference.h
index 21baaadc82..e45a921c21 100644
--- a/src/mod/applications/mod_conference/mod_conference.h
+++ b/src/mod/applications/mod_conference/mod_conference.h
@@ -1124,7 +1124,7 @@ void conference_video_canvas_del_fnode_layer(conference_obj_t *conference, confe
 void conference_video_canvas_set_fnode_layer(mcu_canvas_t *canvas, conference_file_node_t *fnode, int idx);
 void conference_list(conference_obj_t *conference, switch_stream_handle_t *stream, char *delim);
 const char *conference_utils_combine_flag_var(switch_core_session_t *session, const char *var_name);
-int conference_loop_mapping_len();
+int conference_loop_mapping_len(void);
 void conference_api_set_agc(conference_member_t *member, const char *data);
 
 switch_status_t conference_outcall(conference_obj_t *conference,
diff --git a/src/mod/applications/mod_db/mod_db.c b/src/mod/applications/mod_db/mod_db.c
index 0e3e227de7..5f14792f2c 100644
--- a/src/mod/applications/mod_db/mod_db.c
+++ b/src/mod/applications/mod_db/mod_db.c
@@ -280,7 +280,7 @@ static switch_xml_config_item_t config_settings[] = {
 	SWITCH_CONFIG_ITEM_END()
 };
 
-static switch_status_t do_config()
+static switch_status_t do_config(void)
 {
 	switch_cache_db_handle_t *dbh = NULL;
 	switch_status_t status = SWITCH_STATUS_SUCCESS;
diff --git a/src/mod/applications/mod_signalwire/mod_signalwire.c b/src/mod/applications/mod_signalwire/mod_signalwire.c
index 9846e7e1d2..108f99b2c5 100644
--- a/src/mod/applications/mod_signalwire/mod_signalwire.c
+++ b/src/mod/applications/mod_signalwire/mod_signalwire.c
@@ -704,7 +704,7 @@ done:
 	return status;
 }
 
-static switch_status_t load_config()
+static switch_status_t load_config(void)
 {
 	char *cf = "signalwire.conf";
 	switch_xml_t cfg, xml;
@@ -1390,7 +1390,7 @@ static void mod_signalwire_state_register(void)
 	}
 }
 
-static void mod_signalwire_state_ready()
+static void mod_signalwire_state_ready(void)
 {
 	if (globals.profile_update) {
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "Signalwire SIP profile update initiated\n");
diff --git a/src/mod/endpoints/mod_skinny/mod_skinny.c b/src/mod/endpoints/mod_skinny/mod_skinny.c
index c6cfc716c7..64464e4ef6 100644
--- a/src/mod/endpoints/mod_skinny/mod_skinny.c
+++ b/src/mod/endpoints/mod_skinny/mod_skinny.c
@@ -2136,7 +2136,7 @@ void launch_skinny_profile_thread(skinny_profile_t *profile) {
 /*****************************************************************************/
 /* MODULE FUNCTIONS */
 /*****************************************************************************/
-switch_endpoint_interface_t *skinny_get_endpoint_interface()
+switch_endpoint_interface_t *skinny_get_endpoint_interface(void)
 {
 	return skinny_endpoint_interface;
 }
diff --git a/src/mod/endpoints/mod_skinny/mod_skinny.h b/src/mod/endpoints/mod_skinny/mod_skinny.h
index 69096ab64e..aff2ee92c0 100644
--- a/src/mod/endpoints/mod_skinny/mod_skinny.h
+++ b/src/mod/endpoints/mod_skinny/mod_skinny.h
@@ -355,7 +355,7 @@ switch_status_t channel_kill_channel(switch_core_session_t *session, int sig);
 /*****************************************************************************/
 /* MODULE FUNCTIONS */
 /*****************************************************************************/
-switch_endpoint_interface_t *skinny_get_endpoint_interface();
+switch_endpoint_interface_t *skinny_get_endpoint_interface(void);
 
 /*****************************************************************************/
 /* TEXT FUNCTIONS */
diff --git a/src/mod/endpoints/mod_skinny/skinny_api.c b/src/mod/endpoints/mod_skinny/skinny_api.c
index f79f36c014..4657a5a9d3 100644
--- a/src/mod/endpoints/mod_skinny/skinny_api.c
+++ b/src/mod/endpoints/mod_skinny/skinny_api.c
@@ -697,7 +697,7 @@ switch_status_t skinny_api_register(switch_loadable_module_interface_t **module_
 	return SWITCH_STATUS_SUCCESS;
 }
 
-switch_status_t skinny_api_unregister()
+switch_status_t skinny_api_unregister(void)
 {
 	switch_console_set_complete("del skinny");
 
diff --git a/src/mod/endpoints/mod_skinny/skinny_api.h b/src/mod/endpoints/mod_skinny/skinny_api.h
index e246957f0d..833d0c15da 100644
--- a/src/mod/endpoints/mod_skinny/skinny_api.h
+++ b/src/mod/endpoints/mod_skinny/skinny_api.h
@@ -34,7 +34,7 @@
 #define _SKINNY_API_H
 
 switch_status_t skinny_api_register(switch_loadable_module_interface_t **module_interface);
-switch_status_t skinny_api_unregister();
+switch_status_t skinny_api_unregister(void);
 
 #endif /* _SKINNY_API_H */
 
diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index 2fdf0063a9..9255c02664 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.c
@@ -54,7 +54,7 @@ switch_endpoint_interface_t *sofia_endpoint_interface;
 
 #define STRLEN 15
 
-void mod_sofia_shutdown_cleanup();
+void mod_sofia_shutdown_cleanup(void);
 static switch_status_t sofia_on_init(switch_core_session_t *session);
 
 static switch_status_t sofia_on_exchange_media(switch_core_session_t *session);
@@ -6833,7 +6833,7 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_sofia_load)
 	return status;
 }
 
-void mod_sofia_shutdown_cleanup() {
+void mod_sofia_shutdown_cleanup(void) {
 	int sanity = 0;
 	int i;
 	switch_status_t st;
diff --git a/src/mod/endpoints/mod_sofia/test/sipp-based-tests.c b/src/mod/endpoints/mod_sofia/test/sipp-based-tests.c
index 60a7b61a3a..7b2d7964c9 100644
--- a/src/mod/endpoints/mod_sofia/test/sipp-based-tests.c
+++ b/src/mod/endpoints/mod_sofia/test/sipp-based-tests.c
@@ -90,7 +90,7 @@ static const char *test_wait_for_chan_var(switch_channel_t *channel, const char
 	return var;
 }
 
-static switch_bool_t has_ipv6() 
+static switch_bool_t has_ipv6(void)
 {
 	switch_stream_handle_t stream = { 0 };
 	SWITCH_STANDARD_STREAM(stream);
@@ -110,7 +110,7 @@ static switch_bool_t has_ipv6()
 	return SWITCH_TRUE;
 }
 
-static void register_gw()
+static void register_gw(void)
 {
 	switch_stream_handle_t stream = { 0 };
 	SWITCH_STANDARD_STREAM(stream);
@@ -118,7 +118,7 @@ static void register_gw()
 	switch_safe_free(stream.data);
 }
 
-static void unregister_gw()
+static void unregister_gw(void)
 {
 	switch_stream_handle_t stream = { 0 };
 	SWITCH_STANDARD_STREAM(stream);
diff --git a/src/mod/event_handlers/mod_cdr_csv/mod_cdr_csv.c b/src/mod/event_handlers/mod_cdr_csv/mod_cdr_csv.c
index 20259251de..3ec8b060df 100644
--- a/src/mod/event_handlers/mod_cdr_csv/mod_cdr_csv.c
+++ b/src/mod/event_handlers/mod_cdr_csv/mod_cdr_csv.c
@@ -272,7 +272,7 @@ static switch_status_t my_on_reporting(switch_core_session_t *session)
 }
 
 
-static void do_rotate_all()
+static void do_rotate_all(void)
 {
 	switch_hash_index_t *hi;
 	void *val;
@@ -294,7 +294,7 @@ static void do_rotate_all()
 }
 
 
-static void do_teardown()
+static void do_teardown(void)
 {
 	switch_hash_index_t *hi;
 	void *val;
diff --git a/src/mod/xml_int/mod_xml_cdr/mod_xml_cdr.c b/src/mod/xml_int/mod_xml_cdr/mod_xml_cdr.c
index 4e3bd81f78..da038ff37f 100644
--- a/src/mod/xml_int/mod_xml_cdr/mod_xml_cdr.c
+++ b/src/mod/xml_int/mod_xml_cdr/mod_xml_cdr.c
@@ -88,7 +88,7 @@ static size_t httpCallBack(char *buffer, size_t size, size_t nitems, void *outst
 	return size * nitems;
 }
 
-static switch_status_t set_xml_cdr_log_dirs()
+static switch_status_t set_xml_cdr_log_dirs(void)
 {
 	switch_time_exp_t tm;
 	char *path = NULL;
diff --git a/src/switch.c b/src/switch.c
index 19a3d93fad..5011ff2d46 100644
--- a/src/switch.c
+++ b/src/switch.c
@@ -101,7 +101,7 @@ static void handle_SIGTERM(int sig)
 }
 
 /* kill a freeswitch process running in background mode */
-static int freeswitch_kill_background()
+static int freeswitch_kill_background(void)
 {
 	FILE *f;					/* FILE handle to open the pid file */
 	char path[PATH_MAX] = "";		/* full path of the PID file */
diff --git a/src/switch_core.c b/src/switch_core.c
index 4e2b70778a..7ec10d8885 100644
--- a/src/switch_core.c
+++ b/src/switch_core.c
@@ -3566,7 +3566,7 @@ SWITCH_DECLARE(int) switch_stream_system(const char *cmd, switch_stream_handle_t
 	}
 }
 
-SWITCH_DECLARE(uint16_t) switch_core_get_rtp_port_range_start_port()
+SWITCH_DECLARE(uint16_t) switch_core_get_rtp_port_range_start_port(void)
 {
 	uint16_t start_port = 0;
 
@@ -3577,7 +3577,7 @@ SWITCH_DECLARE(uint16_t) switch_core_get_rtp_port_range_start_port()
 	return start_port;
 }
 
-SWITCH_DECLARE(uint16_t) switch_core_get_rtp_port_range_end_port()
+SWITCH_DECLARE(uint16_t) switch_core_get_rtp_port_range_end_port(void)
 {
 	uint16_t end_port = 0;
 
diff --git a/src/switch_log.c b/src/switch_log.c
index 74a5713635..563a554510 100644
--- a/src/switch_log.c
+++ b/src/switch_log.c
@@ -246,7 +246,7 @@ SWITCH_DECLARE(cJSON *) switch_log_node_to_json(const switch_log_node_t *node, i
 	return json;
 }
 
-static switch_log_node_t *switch_log_node_alloc()
+static switch_log_node_t *switch_log_node_alloc(void)
 {
 	switch_log_node_t *node = NULL;
 #ifdef SWITCH_LOG_RECYCLE
diff --git a/src/switch_msrp.c b/src/switch_msrp.c
index 1f5db7ac20..9fd84d846b 100644
--- a/src/switch_msrp.c
+++ b/src/switch_msrp.c
@@ -99,7 +99,7 @@ static switch_bool_t msrp_check_success_report(switch_msrp_msg_t *msrp_msg)
 	return (msrp_h_success_report && !strcmp(msrp_h_success_report, "yes"));
 }
 
-static void msrp_deinit_ssl()
+static void msrp_deinit_ssl(void)
 {
 	globals.ssl_ready = 0;
 	if (globals.ssl_ctx) {
@@ -112,7 +112,7 @@ static void msrp_deinit_ssl()
 	}
 }
 
-static void msrp_init_ssl()
+static void msrp_init_ssl(void)
 {
 	const char *err = "";
 
@@ -187,7 +187,7 @@ static void msrp_init_ssl()
 
 SWITCH_DECLARE_GLOBAL_STRING_FUNC(set_global_ip, globals.ip);
 
-static switch_status_t load_config()
+static switch_status_t load_config(void)
 {
 	char *cf = "msrp.conf";
 	switch_xml_t cfg, xml = NULL, settings, param;
@@ -286,12 +286,12 @@ sock_fail:
 	return rv;
 }
 
-SWITCH_DECLARE(const char *) switch_msrp_listen_ip()
+SWITCH_DECLARE(const char *) switch_msrp_listen_ip(void)
 {
 	return globals.ip;
 }
 
-SWITCH_DECLARE(switch_status_t) switch_msrp_init()
+SWITCH_DECLARE(switch_status_t) switch_msrp_init(void)
 {
 	switch_memory_pool_t *pool;
 	switch_thread_t *thread;
@@ -346,7 +346,7 @@ SWITCH_DECLARE(switch_status_t) switch_msrp_init()
 	return SWITCH_STATUS_SUCCESS;
 }
 
-SWITCH_DECLARE(switch_status_t) switch_msrp_destroy()
+SWITCH_DECLARE(switch_status_t) switch_msrp_destroy(void)
 {
 	switch_status_t st = SWITCH_STATUS_SUCCESS;
 	switch_socket_t *sock;
@@ -1622,7 +1622,7 @@ SWITCH_DECLARE (switch_status_t) switch_msrp_perform_send(switch_msrp_session_t
 	return status;
 }
 
-SWITCH_DECLARE(switch_msrp_msg_t *) switch_msrp_msg_create()
+SWITCH_DECLARE(switch_msrp_msg_t *) switch_msrp_msg_create(void)
 {
 	switch_msrp_msg_t *msg = malloc(sizeof(switch_msrp_msg_t));
 	switch_assert(msg);
diff --git a/src/switch_rtp.c b/src/switch_rtp.c
index 05b0858313..ce6f3062df 100644
--- a/src/switch_rtp.c
+++ b/src/switch_rtp.c
@@ -262,8 +262,8 @@ typedef struct {
 
 struct switch_rtp;
 
-static void switch_rtp_dtls_init();
-static void switch_rtp_dtls_destroy();
+static void switch_rtp_dtls_init(void);
+static void switch_rtp_dtls_destroy(void);
 
 #define MAX_DTLS_MTU 4096
 
@@ -1660,7 +1660,7 @@ static void rtcp_generate_sender_info(switch_rtp_t *rtp_session, struct switch_r
 			);
 }
 
-static inline uint32_t calc_local_lsr_now() 
+static inline uint32_t calc_local_lsr_now(void)
 {
 	switch_time_t now;
 	uint32_t ntp_sec, ntp_usec, lsr_now, sec;
@@ -3493,7 +3493,7 @@ static BIO_METHOD dtls_bio_filter_methods = {
 static BIO_METHOD *dtls_bio_filter_methods = NULL;
 #endif
 
-static void switch_rtp_dtls_init() {
+static void switch_rtp_dtls_init(void) {
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
 	dtls_bio_filter_methods = BIO_meth_new(BIO_TYPE_FILTER | BIO_get_new_index(), "DTLS filter");
 	BIO_meth_set_write(dtls_bio_filter_methods, dtls_bio_filter_write);
@@ -3503,7 +3503,7 @@ static void switch_rtp_dtls_init() {
 #endif
 }
 
-static void switch_rtp_dtls_destroy() {
+static void switch_rtp_dtls_destroy(void) {
 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
 	if (dtls_bio_filter_methods) {
 		BIO_meth_free(dtls_bio_filter_methods);
diff --git a/src/switch_speex.c b/src/switch_speex.c
index 122ae79a73..5a97b082f2 100644
--- a/src/switch_speex.c
+++ b/src/switch_speex.c
@@ -470,7 +470,7 @@ static switch_status_t switch_speex_destroy(switch_codec_t *codec)
 /**
  * read default settings from speex.conf
  */
-static void load_configuration()
+static void load_configuration(void)
 {
 	switch_xml_t xml = NULL, cfg = NULL;
 
diff --git a/src/switch_vpx.c b/src/switch_vpx.c
index e35d87712f..751f2b8c5b 100644
--- a/src/switch_vpx.c
+++ b/src/switch_vpx.c
@@ -1853,7 +1853,7 @@ static void parse_codecs(my_vpx_cfg_t *my_cfg, switch_xml_t codecs)
 	}
 }
 
-static void load_config()
+static void load_config(void)
 {
 	switch_xml_t cfg = NULL, xml = NULL;
 	my_vpx_cfg_t *my_cfg = NULL;