diff --git a/homeassistant/components/insteon/strings.json b/homeassistant/components/insteon/strings.json
index d6690bd4860..b0130910c5f 100644
--- a/homeassistant/components/insteon/strings.json
+++ b/homeassistant/components/insteon/strings.json
@@ -40,7 +40,7 @@
     },
     "abort": {
       "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]",
-      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed"
+      "single_instance_allowed": "[%key:common::config_flow::abort::single_instance_allowed%]"
     }
   },
   "options": {
@@ -106,4 +106,4 @@
       "input_error": "Invalid entries, please check your values."
     }
   }
-}
\ No newline at end of file
+}