diff --git a/unmanaged.cpp b/unmanaged.cpp
index 1a76175605..c10a674a8b 100644
--- a/unmanaged.cpp
+++ b/unmanaged.cpp
@@ -154,5 +154,11 @@ NET::WindowType Unmanaged::windowType(bool direct, int supportedTypes) const
     return info->windowType(NET::WindowTypes(supportedTypes));
 }
 
+void Unmanaged::addDamage(const QRegion &damage)
+{
+    repaints_region += damage;
+    Toplevel::addDamage(damage);
+}
+
 } // namespace
 
diff --git a/unmanaged.h b/unmanaged.h
index 6cee6c1cba..b7dc1ec62d 100644
--- a/unmanaged.h
+++ b/unmanaged.h
@@ -51,6 +51,7 @@ public Q_SLOTS:
     void release(ReleaseReason releaseReason = ReleaseReason::Release);
 protected:
     virtual void debug(QDebug& stream) const;
+    void addDamage(const QRegion &damage) override;
 private:
     virtual ~Unmanaged(); // use release()
     // handlers for X11 events