diff --git a/src/include/switch_types.h b/src/include/switch_types.h
index 72a6797d22..b72faa317c 100644
--- a/src/include/switch_types.h
+++ b/src/include/switch_types.h
@@ -928,7 +928,7 @@ typedef switch_status_t (*switch_waitfor_read_hook_t)(switch_core_session_t *, i
 typedef switch_status_t (*switch_waitfor_write_hook_t)(switch_core_session_t *, int, int);
 typedef switch_status_t (*switch_send_dtmf_hook_t)(switch_core_session_t *, char *);
 typedef struct switch_stream_handle switch_stream_handle_t;
-typedef switch_status_t (*switch_stream_handle_write_function_t)(switch_stream_handle_t *handle, char *fmt, ...);
+typedef switch_status_t (*switch_stream_handle_write_function_t)(switch_stream_handle_t *handle, const char *fmt, ...);
 typedef switch_status_t (*switch_api_function_t)(char *in, switch_core_session_t *session, switch_stream_handle_t *stream);
 typedef switch_status_t (*switch_input_callback_function_t)(switch_core_session_t *session,
 															void *input,
diff --git a/src/mod/xml_int/mod_xml_rpc/mod_xml_rpc.c b/src/mod/xml_int/mod_xml_rpc/mod_xml_rpc.c
index 09d762d501..770d5e6f50 100644
--- a/src/mod/xml_int/mod_xml_rpc/mod_xml_rpc.c
+++ b/src/mod/xml_int/mod_xml_rpc/mod_xml_rpc.c
@@ -126,7 +126,7 @@ SWITCH_MOD_DECLARE(switch_status_t) switch_module_load(const switch_loadable_mod
 }
 
 
-static switch_status_t http_stream_write(switch_stream_handle_t *handle, char *fmt, ...)
+static switch_status_t http_stream_write(switch_stream_handle_t *handle, const char *fmt, ...)
 {
 	va_list ap;
 	TSession *r = handle->data;