diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -532,7 +532,6 @@
     Qt5::DBus
     Qt5::Quick
     Qt5::Script
-    Qt5::X11Extras
 )
 
 set(kwin_KDE_LIBS
@@ -614,7 +613,7 @@
 target_link_libraries(kwin kwinglutils ${epoxy_LIBRARY})
 
 kf5_add_kdeinit_executable(kwin_x11 main_x11.cpp)
-target_link_libraries(kdeinit_kwin_x11 kwin KF5::Crash)
+target_link_libraries(kdeinit_kwin_x11 kwin KF5::Crash Qt5::X11Extras)
 
 install(TARGETS kwin             ${INSTALL_TARGETS_DEFAULT_ARGS} LIBRARY NAMELINK_SKIP )
 install(TARGETS kdeinit_kwin_x11 ${INSTALL_TARGETS_DEFAULT_ARGS} )
diff --git a/platform.h b/platform.h
--- a/platform.h
+++ b/platform.h
@@ -308,6 +308,15 @@
      **/
     virtual OverlayWindow *createOverlayWindow();
 
+    /**
+     * Allows a platform to update the X11 timestamp.
+     * Mostly for the X11 standalone platform to interact with QX11Info.
+     *
+     * Default implementation does nothing. This means code relying on the X timestamp being up to date,
+     * might not be working. E.g. synced X11 window resizing
+     **/
+    virtual void updateXTime();
+
 public Q_SLOTS:
     void pointerMotion(const QPointF &position, quint32 time);
     void pointerButtonPressed(quint32 button, quint32 time);
diff --git a/platform.cpp b/platform.cpp
--- a/platform.cpp
+++ b/platform.cpp
@@ -466,4 +466,8 @@
     return nullptr;
 }
 
+void Platform::updateXTime()
+{
+}
+
 }
diff --git a/plugins/platforms/x11/standalone/x11_platform.h b/plugins/platforms/x11/standalone/x11_platform.h
--- a/plugins/platforms/x11/standalone/x11_platform.h
+++ b/plugins/platforms/x11/standalone/x11_platform.h
@@ -57,6 +57,8 @@
 
     OverlayWindow *createOverlayWindow() override;
 
+    void updateXTime() override;
+
 protected:
     void doHideCursor() override;
     void doShowCursor() override;
diff --git a/plugins/platforms/x11/standalone/x11_platform.cpp b/plugins/platforms/x11/standalone/x11_platform.cpp
--- a/plugins/platforms/x11/standalone/x11_platform.cpp
+++ b/plugins/platforms/x11/standalone/x11_platform.cpp
@@ -315,4 +315,21 @@
     return new OverlayWindowX11();
 }
 
+/*
+ Updates xTime(). This used to simply fetch current timestamp from the server,
+ but that can cause xTime() to be newer than timestamp of events that are
+ still in our events queue, thus e.g. making XSetInputFocus() caused by such
+ event to be ignored. Therefore events queue is searched for first
+ event with timestamp, and extra PropertyNotify is generated in order to make
+ sure such event is found.
+*/
+void X11StandalonePlatform::updateXTime()
+{
+    // NOTE: QX11Info::getTimestamp does not yet search the event queue as the old
+    // solution did. This means there might be regressions currently. See the
+    // documentation above on how it should be done properly.
+    kwinApp()->setX11Time(QX11Info::getTimestamp(), Application::TimestampUpdate::Always);
+}
+
+
 }
diff --git a/utils.cpp b/utils.cpp
--- a/utils.cpp
+++ b/utils.cpp
@@ -35,12 +35,12 @@
 #include <QApplication>
 #include <QDebug>
 
-#include <QX11Info>
 #include <X11/Xlib.h>
 
 #include <stdio.h>
 
 #include "atoms.h"
+#include "platform.h"
 #include "workspace.h"
 
 #include <signal.h>
@@ -72,20 +72,9 @@
 #endif
 
 #ifndef KCMRULES
-/*
- Updates xTime(). This used to simply fetch current timestamp from the server,
- but that can cause xTime() to be newer than timestamp of events that are
- still in our events queue, thus e.g. making XSetInputFocus() caused by such
- event to be ignored. Therefore events queue is searched for first
- event with timestamp, and extra PropertyNotify is generated in order to make
- sure such event is found.
-*/
 void updateXTime()
 {
-    // NOTE: QX11Info::getTimestamp does not yet search the event queue as the old
-    // solution did. This means there might be regressions currently. See the
-    // documentation above on how it should be done properly.
-    kwinApp()->setX11Time(QX11Info::getTimestamp(), Application::TimestampUpdate::Always);
+    kwinApp()->platform()->updateXTime();
 }
 
 static int server_grab_count = 0;