diff --git a/abstract_client.cpp b/abstract_client.cpp
index 143b27c635..a49788e537 100644
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -1028,4 +1028,11 @@ int AbstractClient::borderTop() const
     return 0;
 }
 
+QSize AbstractClient::sizeForClientSize(const QSize &wsize, Sizemode mode, bool noframe) const
+{
+    Q_UNUSED(mode)
+    Q_UNUSED(noframe)
+    return wsize;
+}
+
 }
diff --git a/abstract_client.h b/abstract_client.h
index ba57f680f5..cc4fc84e6a 100644
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -404,6 +404,14 @@ public:
         SizemodeFixedH, ///< Try not to affect height
         SizemodeMax ///< Try not to make it larger in either direction
     };
+    /**
+     *Calculate the appropriate frame size for the given client size @p wsize.
+     *
+     * @p wsize is adapted according to the window's size hints (minimum, maximum and incremental size changes).
+     *
+     * Default implementation returns the passed in @p wsize.
+     */
+    virtual QSize sizeForClientSize(const QSize &wsize, Sizemode mode = SizemodeAny, bool noframe = false) const;
 
     virtual bool hasStrut() const;
 
diff --git a/client.h b/client.h
index 451e5157e1..6698be4000 100644
--- a/client.h
+++ b/client.h
@@ -286,7 +286,7 @@ public:
     void resizeWithChecks(int w, int h, ForceGeometry_t force = NormalGeometrySet) override;
     void resizeWithChecks(int w, int h, xcb_gravity_t gravity, ForceGeometry_t force = NormalGeometrySet);
     void resizeWithChecks(const QSize& s, xcb_gravity_t gravity, ForceGeometry_t force = NormalGeometrySet);
-    QSize sizeForClientSize(const QSize&, Sizemode mode = SizemodeAny, bool noframe = false) const;
+    QSize sizeForClientSize(const QSize&, Sizemode mode = SizemodeAny, bool noframe = false) const override;
 
     /** Set the quick tile mode ("snap") of this window.
      * This will also handle preserving and restoring of window geometry as necessary.