diff --git a/package.json b/package.json
index a5ee7cc5da..1d0ae145c4 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "test-coverage": "run-s test-build-coverage test-serve-coverage",
     "test-alex": "alex ./docs-* *.md",
     "test-lockfile": "lockfile-lint --path yarn.lock --allowed-hosts yarn --validate-https",
-    "test-debug": "node --inspect-brk node_modules/.bin/jest --runInBand",
+    "test-debug": "cross-env LC_ALL=C TZ=UTC NODE_ENV=test node --inspect-brk node_modules/.bin/jest --runInBand",
     "postinstall": "patch-package"
   },
   "license": "MPL-2.0",