diff --git a/scene_opengl.cpp b/scene_opengl.cpp
--- a/scene_opengl.cpp
+++ b/scene_opengl.cpp
@@ -2248,12 +2248,14 @@
     const QRectF outerRect(QPointF(-leftOffset(), -topOffset()),
                            QPointF(topLevel()->width() + rightOffset(), topLevel()->height() + bottomOffset()));
 
-    const int width = qMax(topLeft.width(), bottomLeft.width()) +
-                      qMax(top.width(), bottom.width()) +
-                      qMax(topRight.width(), bottomRight.width());
-    const int height = qMax(topLeft.height(), topRight.height()) +
-                       qMax(left.height(), right.height()) +
-                       qMax(bottomLeft.height(), bottomRight.height());
+    const int width = qMax(left.width() + right.width(),
+                       qMax(topLeft.width(), bottomLeft.width()) +
+                       qMax(top.width(), bottom.width()) +
+                       qMax(topRight.width(), bottomRight.width()));
+    const int height = qMax(top.height() + bottom.height(),
+                        qMax(topLeft.height(), topRight.height()) +
+                        qMax(left.height(), right.height()) +
+                        qMax(bottomLeft.height(), bottomRight.height()));
 
     qreal tx1(0.0), tx2(0.0), ty1(0.0), ty2(0.0);
 
@@ -2355,13 +2357,15 @@
     const QSize topLeft(shadowPixmap(ShadowElementTopLeft).size());
     const QSize bottomRight(shadowPixmap(ShadowElementBottomRight).size());
 
-    const int width = qMax(topLeft.width(), bottomLeft.width()) +
-                      qMax(top.width(), bottom.width()) +
-                      qMax(topRight.width(), bottomRight.width());
+    const int width = qMax(left.width() + right.width(),
+                       qMax(topLeft.width(), bottomLeft.width()) +
+                       qMax(top.width(), bottom.width()) +
+                       qMax(topRight.width(), bottomRight.width()));
 
-    const int height = qMax(topRight.height(), topLeft.height()) +
-                       qMax(left.height(), right.height()) +
-                       qMax(bottomLeft.height(), bottomRight.height());
+    const int height = qMax(top.height() + bottom.height(),
+                        qMax(topRight.height(), topLeft.height()) +
+                        qMax(left.height(), right.height()) +
+                        qMax(bottomLeft.height(), bottomRight.height()));
 
     if (width == 0 || height == 0) {
         return false;