diff --git a/tests/use_count/use_count_test.c b/tests/use_count/use_count_test.c
index 2942c69..b784aeb 100644
--- a/tests/use_count/use_count_test.c
+++ b/tests/use_count/use_count_test.c
@@ -192,7 +192,7 @@
 	return foo;
 }
 
-void print_foos()
+void print_foos(void)
 {
 	int count = 0;
 	struct foo *foo;
@@ -204,7 +204,7 @@
 	fprintf(stderr, "%d foos\n\n", count);
 }
 
-static void test_use_count_fsm()
+static void test_use_count_fsm(void)
 {
 	struct foo *a, *b, *c;
 	log("\n%s()\n", __func__);