diff --git a/src/components/views/messages/CallEvent.tsx b/src/components/views/messages/CallEvent.tsx
index 594b0b7d99..f723f5f66f 100644
--- a/src/components/views/messages/CallEvent.tsx
+++ b/src/components/views/messages/CallEvent.tsx
@@ -199,7 +199,7 @@ export default class CallEvent extends React.PureComponent<IProps, IState> {
             } else if (hangupReason === CallErrorCode.UserBusy) {
                 reason = _t("The user you called is busy.");
             } else {
-                reason = _t('Unknown failure: %(reason)s)', { reason: hangupReason });
+                reason = _t('Unknown failure: %(reason)s', { reason: hangupReason });
             }
 
             return (
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 33746e3f8b..bf352a6294 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -1892,7 +1892,7 @@
     "Connection failed": "Connection failed",
     "Their device couldn't start the camera or microphone": "Their device couldn't start the camera or microphone",
     "An unknown error occurred": "An unknown error occurred",
-    "Unknown failure: %(reason)s)": "Unknown failure: %(reason)s)",
+    "Unknown failure: %(reason)s": "Unknown failure: %(reason)s",
     "Retry": "Retry",
     "Missed call": "Missed call",
     "The call is in an unknown state!": "The call is in an unknown state!",