diff --git a/src/components/views/elements/MemberEventListSummary.js b/src/components/views/elements/MemberEventListSummary.js
index de6f801a21..c0bb6bcae1 100644
--- a/src/components/views/elements/MemberEventListSummary.js
+++ b/src/components/views/elements/MemberEventListSummary.js
@@ -478,7 +478,7 @@ module.exports = React.createClass({
         }
         const toggleButton = (
             <div className={"mx_MemberEventListSummary_toggle"} onClick={this._toggleSummary}>
-                { expanded ? 'collapse' : 'expand' }
+                { expanded ? _t('collapse') : _t('expand') }
             </div>
         );
 
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 83793291c9..2039d09368 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -581,6 +581,8 @@
     "%(items)s and %(count)s others|other": "%(items)s and %(count)s others",
     "%(items)s and %(count)s others|one": "%(items)s and one other",
     "%(items)s and %(lastItem)s": "%(items)s and %(lastItem)s",
+    "collapse": "collapse",
+    "expand": "expand",
     "Custom level": "Custom level",
     "Room directory": "Room directory",
     "Start chat": "Start chat",