diff --git a/src/widgets/widgets/qdockwidget.cpp b/src/widgets/widgets/qdockwidget.cpp
index bf33ab2a4a2..8f027f7e3b5 100644
--- a/src/widgets/widgets/qdockwidget.cpp
+++ b/src/widgets/widgets/qdockwidget.cpp
@@ -133,7 +133,7 @@ QSize QDockWidgetTitleButton::dockButtonIconSize() const
     if (m_iconSize < 0) {
         m_iconSize = style()->pixelMetric(QStyle::PM_SmallIconSize, nullptr, this);
         if (style()->styleHint(QStyle::SH_DockWidget_ButtonsHaveFrame, nullptr, this))
-            m_iconSize = (m_iconSize * 3) / 4;
+            m_iconSize = (m_iconSize * 5) / 8;  // 16 -> 10
     }
     return QSize(m_iconSize, m_iconSize);
 }