diff --git a/packages/app/package.json b/packages/app/package.json
index 1506979c2e..1ec0a1f992 100644
--- a/packages/app/package.json
+++ b/packages/app/package.json
@@ -6,7 +6,7 @@
     "postinstall": "rm -rf ./node_modules/react && rm -rf ./node_modules/react-dom",
     "start": "webpack-dev-server --env NODE_ENV=development",
     "build": "cross-env NODE_OPTIONS=--max-old-space-size=8192 webpack --progress --env NODE_ENV=production",
-    "test": "cross-env TZ=GMT jest --silent",
+    "test": "cross-env LC_ALL=C TZ=GMT jest --silent",
     "coverage": "cross-env TZ=GMT jest --coverage --silent",
     "lint": "eslint \"{app,test}/**/**.{js,jsx,ts,tsx}\"",
     "lint:fix": "eslint \"{app,test}/**/**.{js,jsx,ts,tsx}\" --fix",