diff --git a/.travis.yml b/.travis.yml
index 6e6c50534..d33b719c4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,6 @@ before_script:
 - sudo ntpdate -u time.google.com
 - date
 script:
-- go test -tags json -v v2ray.com/core/...
+- go test -p 1 -tags json -v v2ray.com/core/...
 after_success:
 - ./testing/coverage/coverall
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index c037625c8..9a035c9de 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -21,7 +21,7 @@
     },
     {
       "taskName": "test",
-      "args": ["v2ray.com/core/..."],
+      "args": ["-p", "1", "v2ray.com/core/..."],
       "isBuildCommand": false
     }
   ]