diff --git a/placement.cpp b/placement.cpp
index 59e574c31e..add860e60b 100644
--- a/placement.cpp
+++ b/placement.cpp
@@ -467,7 +467,7 @@ void Placement::placeCentered(Client* c, const QRect& area, Policy /*next*/)
 /*!
   Place windows in the (0,0) corner, on top of all others
 */
-void Placement::placeZeroCornered(Client* c, const QRect& area, Policy /*next*/)
+void Placement::placeZeroCornered(AbstractClient* c, const QRect& area, Policy /*next*/)
 {
     // get the maximum allowed windows space and desk's origin
     c->move(checkArea(c, area).topLeft());
diff --git a/placement.h b/placement.h
index a04eed359a..ca0b10f401 100644
--- a/placement.h
+++ b/placement.h
@@ -69,7 +69,7 @@ public:
     void placeSmart(Client* c, const QRect& area, Policy next = Unknown);
     void placeMaximizing(Client* c, QRect& area, Policy next = Unknown);
     void placeCentered(Client* c, const QRect& area, Policy next = Unknown);
-    void placeZeroCornered(Client* c, const QRect& area, Policy next = Unknown);
+    void placeZeroCornered(AbstractClient* c, const QRect& area, Policy next = Unknown);
     void placeDialog(Client* c, QRect& area, Policy next = Unknown);
     void placeUtility(Client* c, QRect& area, Policy next = Unknown);
     void placeOnScreenDisplay(Client* c, QRect& area);