diff --git a/_locales/en/messages.json b/_locales/en/messages.json
index e7b0c537..75bd412f 100644
--- a/_locales/en/messages.json
+++ b/_locales/en/messages.json
@@ -56,6 +56,10 @@
     "message": "Remove",
     "description": "Label for the button to remove an 'applies' entry"
   },
+  "appliesRemoveError": {
+    "message": "Can not remove last 'applies to' entry",
+    "description": "Error displayed when the last 'applies' is going to be removed"
+  },
   "appliesSpecify": {
     "message": "Specify",
     "description": "Label for the button to make a style apply only to specific sites"
diff --git a/edit/applies-to-line-widget.js b/edit/applies-to-line-widget.js
index cbb0886a..5e170755 100644
--- a/edit/applies-to-line-widget.js
+++ b/edit/applies-to-line-widget.js
@@ -264,8 +264,7 @@ function createAppliesToLineWidget(cm) {
           let to;
           if (applies.length < 2) {
             messageBox({
-              title: 'Error',
-              contents: 'Can\'t remove last applies-to',
+              contents: chrome.i18n.getMessage('appliesRemoveError'),
               buttons: [t('confirmClose')]
             });
             return;