diff --git a/src/components/structures/GroupView.js b/src/components/structures/GroupView.js
index 8884396c01..2cb791b689 100644
--- a/src/components/structures/GroupView.js
+++ b/src/components/structures/GroupView.js
@@ -948,7 +948,7 @@ export default React.createClass({
         if ((!group || group.myMembership === 'leave') &&
             this.state.summary &&
             this.state.summary.profile &&
-            Boolean(this.state.summary.profile.is_joinable)
+            Boolean(this.state.summary.profile.is_openly_joinable)
         ) {
             membershipButtonText = _t("Join this community");
             membershipButtonOnClick = this._onJoinClick;