diff --git a/utils/osmo-ns-dummy.c b/utils/osmo-ns-dummy.c
index 0af1a89..eabe008 100644
--- a/utils/osmo-ns-dummy.c
+++ b/utils/osmo-ns-dummy.c
@@ -43,7 +43,7 @@
 	.copyright	= vty_copyright,
 };
 
-static void print_help()
+static void print_help(void)
 {
 	printf( "Some useful options:\n"
 		"  -h	--help			This text\n"