diff --git a/js/ui/screenShield.js b/js/ui/screenShield.js
index 7e428623e..d2236fb90 100644
--- a/js/ui/screenShield.js
+++ b/js/ui/screenShield.js
@@ -427,8 +427,7 @@ export class ScreenShield extends Signals.EventEmitter {
 
             this._dialog = new constructor(this._lockDialogGroup);
 
-            let time = global.get_current_time();
-            if (!this._dialog.open(time)) {
+            if (!this._dialog.open()) {
                 // This is kind of an impossible error: we're already modal
                 // by the time we reach this...
                 log('Could not open login dialog: failed to acquire grab');
diff --git a/js/ui/unlockDialog.js b/js/ui/unlockDialog.js
index 8a40845de..29240a941 100644
--- a/js/ui/unlockDialog.js
+++ b/js/ui/unlockDialog.js
@@ -876,17 +876,14 @@ export const UnlockDialog = GObject.registerClass({
         this._authPrompt.finish(onComplete);
     }
 
-    open(timestamp) {
+    open() {
         this.show();
 
         if (this._isModal)
             return true;
 
-        let modalParams = {
-            timestamp,
-            actionMode: Shell.ActionMode.UNLOCK_SCREEN,
-        };
-        let grab = Main.pushModal(Main.uiGroup, modalParams);
+        const grab = Main.pushModal(Main.uiGroup,
+            {actionMode: Shell.ActionMode.UNLOCK_SCREEN});
         if (grab.get_seat_state() !== Clutter.GrabState.ALL) {
             Main.popModal(grab);
             return false;
@@ -902,9 +899,9 @@ export const UnlockDialog = GObject.registerClass({
         this._showPrompt();
     }
 
-    popModal(timestamp) {
+    popModal() {
         if (this._isModal) {
-            Main.popModal(this._grab, timestamp);
+            Main.popModal(this._grab);
             this._grab = null;
             this._isModal = false;
         }