diff --git a/frontend/src/i18n/lang/no-NO.json b/frontend/src/i18n/lang/no-NO.json
index 25ff1293e..babbbc18c 100644
--- a/frontend/src/i18n/lang/no-NO.json
+++ b/frontend/src/i18n/lang/no-NO.json
@@ -1124,7 +1124,7 @@
     }
   },
   "date": {
-    "locale": "nb_NO",
+    "locale": "nn",
     "altFormatLong": "d.m.y H:i",
     "altFormatShort": "d.m.y"
   },