diff --git a/homeassistant/components/iometer/strings.json b/homeassistant/components/iometer/strings.json
index 6e149354eee..65a962cb42b 100644
--- a/homeassistant/components/iometer/strings.json
+++ b/homeassistant/components/iometer/strings.json
@@ -21,7 +21,7 @@
     },
     "error": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
-      "unknown": "Unexpected error"
+      "unknown": "[%key:common::config_flow::error::unknown%]"
     }
   },
   "entity": {