diff --git a/src/gui/idletimer.cpp b/src/gui/idletimer.cpp
index bb487e13..4fcbd8c8 100644
--- a/src/gui/idletimer.cpp
+++ b/src/gui/idletimer.cpp
@@ -3,18 +3,26 @@
 #include <QtGlobal>
 #include <QByteArray>
 #include <QString>
+#include <QWindow>
 
 #ifdef USE_XCB_SCREENSAVER
-#include <xcb/xcb.h>
 #include <QX11Info>
+#include <xcb/xcb.h>
 #include <xcb/screensaver.h>
 #include <limits.h>
 
-int IdleTimer::getIdleTime(){
-    xcb_connection_t* conn = QX11Info::connection();
-    const int display = QX11Info::appScreen();
+#include "mainwindow.h"
 
-    xcb_screensaver_query_info_cookie_t replyCookie = xcb_screensaver_query_info(conn, QX11Info::appRootWindow(display));
+int IdleTimer::getIdleTime(){
+    const MainWindow* const mw = MainWindow::mainWindow;
+    if(!mw || !mw->windowHandle())
+        return 0;
+    xcb_connection_t* conn = QX11Info::connection();
+
+    xcb_get_geometry_cookie_t geomCookie = xcb_get_geometry(conn, mw->windowHandle()->winId());
+    xcb_get_geometry_reply_t* geomReply = xcb_get_geometry_reply(conn, geomCookie, nullptr);
+
+    xcb_screensaver_query_info_cookie_t replyCookie = xcb_screensaver_query_info(conn, geomReply->root);
     xcb_screensaver_query_info_reply_t* replyInfo = xcb_screensaver_query_info_reply(conn, replyCookie, nullptr);
 
     uint32_t userIdle = replyInfo->ms_since_user_input;