diff --git a/frontend/package.json b/frontend/package.json
index 4b01215f..4a2a1954 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -14,9 +14,9 @@
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
     "lint": "eslint .",
     "format": "prettier --write .",
-    "test:unit": "vitest run",
-    "test:unit:watch": "vitest",
-    "test:unit:coverage": "rm -rf ../tests/e2e/.nyc_output_unit && COVERAGE=1 vitest run"
+    "test:unit": "LANG=C vitest run",
+    "test:unit:watch": "LANG=C vitest",
+    "test:unit:coverage": "rm -rf ../tests/e2e/.nyc_output_unit && LANG=C COVERAGE=1 vitest run"
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",