diff --git a/libs/freetdm/src/ozmod/ozmod_sangoma_boost/sangoma_boost_interface.h b/libs/freetdm/src/ozmod/ozmod_sangoma_boost/sangoma_boost_interface.h
index 3b5d11b007..c337995dca 100644
--- a/libs/freetdm/src/ozmod/ozmod_sangoma_boost/sangoma_boost_interface.h
+++ b/libs/freetdm/src/ozmod/ozmod_sangoma_boost/sangoma_boost_interface.h
@@ -147,14 +147,14 @@ typedef zap_status_t (*boost_stop_span_func_t) BOOST_START_SPAN_ARGS;
  */
 #define BOOST_ON_LOAD_ARGS (void) 
 typedef zap_status_t (*boost_on_load_func_t) BOOST_ON_LOAD_ARGS;
-#define BOOST_ON_LOAD_FUNCTION(name) void name BOOST_ON_LOAD_ARGS 
+#define BOOST_ON_LOAD_FUNCTION(name) zap_status_t name BOOST_ON_LOAD_ARGS 
 
 /*! 
   \brief Called when the module is being unloaded, last chance to stop everything!
  */
 #define BOOST_ON_UNLOAD_ARGS (void) 
 typedef zap_status_t (*boost_on_unload_func_t) BOOST_ON_UNLOAD_ARGS;
-#define BOOST_ON_UNLOAD_FUNCTION(name) void name BOOST_ON_UNLOAD_ARGS 
+#define BOOST_ON_UNLOAD_FUNCTION(name) zap_status_t name BOOST_ON_UNLOAD_ARGS 
 
 /*! 
   \brief The boost signaling module interface