diff --git a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_delete/2-1.c b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_delete/2-1.c
index 451ae4d36d..28b2e592fb 100644
--- a/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_delete/2-1.c
+++ b/src/tests/system/libroot/posix/posixtestsuite/conformance/interfaces/pthread_key_delete/2-1.c
@@ -53,6 +53,7 @@ void *a_thread_func()
 	
 	/* The thread ends here, the destructor for the key should now be called after this */
 	pthread_exit(0);
+	return NULL;
 }
 
 int main()