diff --git a/kernel/tests.c b/kernel/tests.c
index 0caaec11..6ae29885 100644
--- a/kernel/tests.c
+++ b/kernel/tests.c
@@ -98,6 +98,8 @@ static int STDCALL userfoo(void* arg)
 
 	/* task exit */
 	SYSCALL1(__NR_exit, 0);
+
+	return 0;
 }
 
 static int STDCALL join_test(void* arg)