diff --git a/tests/evtimer_mbox/main.c b/tests/evtimer_mbox/main.c
index 5241ba72e4..db30d58f32 100644
--- a/tests/evtimer_mbox/main.c
+++ b/tests/evtimer_mbox/main.c
@@ -84,4 +84,6 @@ int main(void)
     if (!failed) {
         puts("Test successful\n");
     }
+
+    return 0;
 }