diff --git a/src/xdgshellwindow.cpp b/src/xdgshellwindow.cpp
index ddc476d66b..61e588a898 100644
--- a/src/xdgshellwindow.cpp
+++ b/src/xdgshellwindow.cpp
@@ -691,8 +691,8 @@ XdgSurfaceConfigure *XdgToplevelWindow::sendRoleConfigure() const
 
     QSizeF nextClientSize = moveResizeGeometry().size();
     if (!nextClientSize.isEmpty()) {
-        nextClientSize.rwidth() -= framePadding.width();
-        nextClientSize.rheight() -= framePadding.height();
+        nextClientSize.setWidth(std::max(1.0, nextClientSize.width() - framePadding.width()));
+        nextClientSize.setHeight(std::max(1.0, nextClientSize.height() - framePadding.height()));
     }
 
     if (nextClientSize.isEmpty()) {