diff --git a/tests/server/sws.c b/tests/server/sws.c
index c2f62384b8..ba7ca152ce 100644
--- a/tests/server/sws.c
+++ b/tests/server/sws.c
@@ -1794,7 +1794,7 @@ http_connect_cleanup:
 static void http_upgrade(struct sws_httprequest *req)
 {
   (void)req;
-  logmsg("Upgraded to ... %u", req->upgrade_request);
+  logmsg("Upgraded to ... %d", (int)req->upgrade_request);
   /* left to implement */
 }