diff --git a/js/ui/notificationDaemon.js b/js/ui/notificationDaemon.js
index c3ae212ac..d2a50d0e3 100644
--- a/js/ui/notificationDaemon.js
+++ b/js/ui/notificationDaemon.js
@@ -465,6 +465,14 @@ Source.prototype = {
         if (event.type() != Clutter.EventType.BUTTON_RELEASE)
             return false;
 
+        // Left clicks are passed through only where there aren't unacknowledged
+        // notifications, so it possible to open them in summary mode; right
+        // clicks are always forwarded, as the right click menu is not useful for
+        // tray icons
+        if (event.get_button() == 1 &&
+            this.notifications.length > 0)
+            return false;
+
         if (Main.overview.visible) {
             // We can't just connect to Main.overview's 'hidden' signal,
             // because it's emitted *before* it calls popModal()...