diff --git a/src/trau/osmo_ortp.c b/src/trau/osmo_ortp.c
index 5761d78..b681888 100644
--- a/src/trau/osmo_ortp.c
+++ b/src/trau/osmo_ortp.c
@@ -262,7 +262,7 @@
 	return 0;
 }
 
-static void create_payload_types()
+static void create_payload_types(void)
 {
 	PayloadType *pt;