diff --git a/tools/prepare_nailgun.sh b/tools/prepare_nailgun.sh
index b509e1b..6d5acba 100644
--- a/tools/prepare_nailgun.sh
+++ b/tools/prepare_nailgun.sh
@@ -69,7 +69,7 @@ run_server() {
 
             local http_code=$(curl -s -w %{http_code} -o /dev/null $check_url)
 
-            if [[ "$http_code" = "200" ]]; then return 0; fi
+            if [[ "$http_code" != "000" ]]; then return 0; fi
 
             sleep 0.1
             i=$((i + 1))