diff --git a/src/qwaylandlayersurface.cpp b/src/qwaylandlayersurface.cpp
index 7707163..10bc3f5 100644
--- a/src/qwaylandlayersurface.cpp
+++ b/src/qwaylandlayersurface.cpp
@@ -140,4 +140,20 @@ void QWaylandLayerSurface::setLayer(uint32_t layer)
         set_layer(layer);
 }
 
+void QWaylandLayerSurface::setWindowGeometry(const QRect &geometry)
+{
+    LayerShellQt::Window *interface = Window::get(window()->window());
+    const bool horizontallyConstrained = interface->anchors() & (Window::AnchorLeft & Window::AnchorRight);
+    const bool verticallyConstrained = interface->anchors() & (Window::AnchorTop & Window::AnchorBottom);
+
+    QSize size = geometry.size();
+    if (horizontallyConstrained) {
+        size.setWidth(0);
+    }
+    if (verticallyConstrained) {
+        size.setHeight(0);
+    }
+    set_size(size.width(), size.height());
+}
+
 }
diff --git a/src/qwaylandlayersurface_p.h b/src/qwaylandlayersurface_p.h
index 9e3e8ed..4d61d26 100644
--- a/src/qwaylandlayersurface_p.h
+++ b/src/qwaylandlayersurface_p.h
@@ -39,6 +39,7 @@ public:
     void setLayer(uint32_t layer);
 
     void applyConfigure() override;
+    void setWindowGeometry(const QRect &geometry) override;
 
 private:
     void zwlr_layer_surface_v1_configure(uint32_t serial, uint32_t width, uint32_t height) override;