diff --git a/xdgshellclient.cpp b/xdgshellclient.cpp
--- a/xdgshellclient.cpp
+++ b/xdgshellclient.cpp
@@ -389,7 +389,10 @@
 
 void XdgShellClient::addDamage(const QRegion &damage)
 {
-    repaints_region += damage.translated(clientPos());
+    const int offsetX = m_bufferGeometry.x() - frameGeometry().x();
+    const int offsetY = m_bufferGeometry.y() - frameGeometry().y();
+    repaints_region += damage.translated(offsetX, offsetY);
+
     Toplevel::addDamage(damage);
 }