diff --git a/autotests/test_window_paint_data.cpp b/autotests/test_window_paint_data.cpp
index c004842eab..82f06dc258 100644
--- a/autotests/test_window_paint_data.cpp
+++ b/autotests/test_window_paint_data.cpp
@@ -104,6 +104,9 @@ public:
     QRect bufferGeometry() const override {
         return QRect();
     }
+    QRect clientGeometry() const override {
+        return QRect();
+    }
     int screen() const override {
         return 0;
     }
diff --git a/src/effects.cpp b/src/effects.cpp
index 9ae1af2963..ffa7bc8210 100644
--- a/src/effects.cpp
+++ b/src/effects.cpp
@@ -1893,6 +1893,7 @@ TOPLEVEL_HELPER(int, screen, screen)
 TOPLEVEL_HELPER(QRect, geometry, frameGeometry)
 TOPLEVEL_HELPER(QRect, frameGeometry, frameGeometry)
 TOPLEVEL_HELPER(QRect, bufferGeometry, bufferGeometry)
+TOPLEVEL_HELPER(QRect, clientGeometry, clientGeometry)
 TOPLEVEL_HELPER(QRect, expandedGeometry, visibleGeometry)
 TOPLEVEL_HELPER(QRect, rect, rect)
 TOPLEVEL_HELPER(int, desktop, desktop)
diff --git a/src/effects.h b/src/effects.h
index e601050a5b..fc826d1db8 100644
--- a/src/effects.h
+++ b/src/effects.h
@@ -421,6 +421,7 @@ public:
     QRect geometry() const override;
     QRect frameGeometry() const override;
     QRect bufferGeometry() const override;
+    QRect clientGeometry() const override;
 
     QString caption() const override;
 
diff --git a/src/libkwineffects/kwineffects.h b/src/libkwineffects/kwineffects.h
index 7e3b2b0615..9dc00fba33 100644
--- a/src/libkwineffects/kwineffects.h
+++ b/src/libkwineffects/kwineffects.h
@@ -2276,6 +2276,7 @@ public:
      * @since 5.18
      */
     virtual QRect bufferGeometry() const = 0;
+    virtual QRect clientGeometry() const = 0;
     /**
      * Geometry of the window including decoration and potentially shadows.
      * May be different from geometry() if the window has a shadow.