diff --git a/src/include/switch_core.h b/src/include/switch_core.h
index 71fc32546b..97c44b513b 100644
--- a/src/include/switch_core.h
+++ b/src/include/switch_core.h
@@ -506,7 +506,7 @@ SWITCH_DECLARE(switch_memory_pool_t *) switch_core_session_get_pool(_In_ switch_
   \return the newly created session
 */
 SWITCH_DECLARE(switch_core_session_t *) switch_core_session_request_uuid(_In_ const switch_endpoint_interface_t *endpoint_interface,
-																		 _Inout_opt_ switch_memory_pool_t **pool, _In_ const char *use_uuid);
+																		 _Inout_opt_ switch_memory_pool_t **pool, _In_opt_z_ const char *use_uuid);
 #define switch_core_session_request(_ep, _p) switch_core_session_request_uuid(_ep, _p, NULL)
 
 SWITCH_DECLARE(switch_status_t) switch_core_session_set_uuid(switch_core_session_t *session, const char *use_uuid);