diff --git a/cache.c b/cache.c
index 7615920a..9ed94029 100644
--- a/cache.c
+++ b/cache.c
@@ -674,6 +674,7 @@ clear:
 		close(ctl_poll.fd);
 	}
 
+	return NULL;
 }
 
 int uwsgi_cache_server(char *socket, int threads) {