diff --git a/abstract_client.cpp b/abstract_client.cpp
index 62a609cd62..c4bedb91c6 100644
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -137,4 +137,8 @@ void AbstractClient::doSetActive()
 {
 }
 
+void AbstractClient::updateLayer()
+{
+}
+
 }
diff --git a/abstract_client.h b/abstract_client.h
index 1d8dde372e..e9637d1761 100644
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -193,6 +193,7 @@ public:
      * @param mode The tile mode (left/right) to give this window.
      */
     virtual void setQuickTileMode(QuickTileMode mode, bool keyboard = false) = 0;
+    virtual void updateLayer();
 
     // TODO: remove boolean trap
     static bool belongToSameApplication(const AbstractClient* c1, const AbstractClient* c2, bool active_hack = false);
diff --git a/client.h b/client.h
index 90a1eba23e..d2e7801440 100644
--- a/client.h
+++ b/client.h
@@ -392,7 +392,7 @@ public:
     virtual Layer layer() const;
     Layer belongsToLayer() const;
     void invalidateLayer();
-    void updateLayer();
+    void updateLayer() override;
     int sessionStackingOrder() const;
 
     void setModal(bool modal);
diff --git a/layers.cpp b/layers.cpp
index 32dc02c309..5cfaadbd19 100644
--- a/layers.cpp
+++ b/layers.cpp
@@ -102,7 +102,7 @@ namespace KWin
 // Workspace
 //*******************************
 
-void Workspace::updateClientLayer(Client* c)
+void Workspace::updateClientLayer(AbstractClient* c)
 {
     if (c)
         c->updateLayer();
diff --git a/workspace.h b/workspace.h
index 7f42121f18..5ef8dfa57b 100644
--- a/workspace.h
+++ b/workspace.h
@@ -180,7 +180,7 @@ public:
     void lowerClientRequest(Client* c, NET::RequestSource src, xcb_timestamp_t timestamp);
     void restackClientUnderActive(AbstractClient*);
     void restack(AbstractClient *c, AbstractClient *under, bool force = false);
-    void updateClientLayer(Client* c);
+    void updateClientLayer(AbstractClient* c);
     void raiseOrLowerClient(AbstractClient*);
     void resetUpdateToolWindowsTimer();
     void restoreSessionStackingOrder(Client* c);