diff --git a/src/qwaylandlayersurface.cpp b/src/qwaylandlayersurface.cpp
index 382ccbc..b7e9cdf 100644
--- a/src/qwaylandlayersurface.cpp
+++ b/src/qwaylandlayersurface.cpp
@@ -195,7 +195,7 @@ void QWaylandLayerSurface::setWindowGeometry(const QRect &geometry)
 #else
 void QWaylandLayerSurface::setWindowSize(const QSize &size)
 {
-    if (!m_explicitDesiredSize) {
+    if (m_interface->desiredSize().isNull()) {
         setDesiredSize(size);
     }
 }