diff --git a/src/surfaceitem.cpp b/src/surfaceitem.cpp
index 60bbf4d905..faab5cd3af 100644
--- a/src/surfaceitem.cpp
+++ b/src/surfaceitem.cpp
@@ -128,6 +128,7 @@ void SurfaceItem::preprocess()
 WindowQuadList SurfaceItem::buildQuads() const
 {
     const QRegion region = shape();
+    const auto size = pixmap()->size();
 
     WindowQuadList quads;
     quads.reserve(region.rectCount());
@@ -140,8 +141,6 @@ WindowQuadList SurfaceItem::buildQuads() const
         const QPointF bufferBottomRight = m_surfaceToBufferMatrix.map(rect.bottomRight());
         const QPointF bufferBottomLeft = m_surfaceToBufferMatrix.map(rect.bottomLeft());
 
-        const auto size = m_pixmap->size();
-
         quad[0] = WindowVertex(rect.topLeft(), QPointF{bufferTopLeft.x() / size.width(), bufferTopLeft.y() / size.height()});
         quad[1] = WindowVertex(rect.topRight(), QPointF{bufferTopRight.x() / size.width(), bufferTopRight.y() / size.height()});
         quad[2] = WindowVertex(rect.bottomRight(), QPointF{bufferBottomRight.x() / size.width(), bufferBottomRight.y() / size.height()});