diff --git a/js/ui/endSessionDialog.js b/js/ui/endSessionDialog.js
index 2a6e6c8f8..198d31b03 100644
--- a/js/ui/endSessionDialog.js
+++ b/js/ui/endSessionDialog.js
@@ -505,7 +505,7 @@ const EndSessionDialog = new Lang.Class({
         this._type = type;
 
         if (!(this._type in DialogContent)) {
-            invocation.report_dbus_error('org.gnome.Shell.ModalDialog.TypeError',
+            invocation.return_dbus_error('org.gnome.Shell.ModalDialog.TypeError',
                                          "Unknown dialog type requested");
             return;
         }
@@ -521,7 +521,7 @@ const EndSessionDialog = new Lang.Class({
         this._updateButtons();
 
         if (!this.open(timestamp)) {
-            invocation.report_dbus_error('org.gnome.Shell.ModalDialog.GrabError',
+            invocation.return_dbus_error('org.gnome.Shell.ModalDialog.GrabError',
                                          "Cannot grab pointer and keyboard");
             return;
         }