diff --git a/tests/tdef/tdef_vty_config_root_test.c b/tests/tdef/tdef_vty_config_root_test.c
index aa5ff1b..e2dbcb4 100644
--- a/tests/tdef/tdef_vty_config_root_test.c
+++ b/tests/tdef/tdef_vty_config_root_test.c
@@ -111,7 +111,7 @@
 	return CMD_SUCCESS;
 }
 
-static void timer_init_vty()
+static void timer_init_vty(void)
 {
 	/* Again, this is merely to get a vty write hook, see above. */
 	install_node(&timer_node, config_write_timer);
@@ -123,7 +123,7 @@
 
 void *root_ctx = NULL;
 
-static void print_help()
+static void print_help(void)
 {
 	printf( "options:\n"
 		"  -h	--help		this text\n"