diff --git a/src/components/views/messages/CallEvent.tsx b/src/components/views/messages/CallEvent.tsx
index 85b9e7f365..6139a2df6b 100644
--- a/src/components/views/messages/CallEvent.tsx
+++ b/src/components/views/messages/CallEvent.tsx
@@ -148,10 +148,9 @@ export default class CallEvent extends React.Component<IProps, IState> {
             );
         }
 
-        // XXX: Should we translate this?
         return (
             <div className="mx_CallEvent_content">
-                { "The call is in an unknown state!" }
+                { _t("The call is in an unknown state!") }
             </div>
         );
     }
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 573f22a7f3..2db181285a 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -1810,6 +1810,7 @@
     "This call has failed": "This call has failed",
     "You missed this call": "You missed this call",
     "Call back": "Call back",
+    "The call is in an unknown state!": "The call is in an unknown state!",
     "Sunday": "Sunday",
     "Monday": "Monday",
     "Tuesday": "Tuesday",