Index: src/kmessagebox.cpp
===================================================================
--- src/kmessagebox.cpp
+++ src/kmessagebox.cpp
@@ -214,6 +214,7 @@
     const int spacingHint = mainWidget->style()->pixelMetric(QStyle::PM_DefaultLayoutSpacing);
     mainLayout->setSpacing(spacingHint * 2); // provide extra spacing
     mainLayout->setMargin(0);
+    buttons->setParent(dialog);
 
     QHBoxLayout *hLayout = new QHBoxLayout();
     hLayout->setMargin(0);
@@ -346,7 +347,6 @@
         detailsGroup->hide();
     }
 
-    buttons->setParent(dialog);
     topLayout->addWidget(buttons);
 
     if (!usingListWidget && !usingScrollArea && !usingSqueezedTextLabel && details.isEmpty()) {