diff --git a/src/widgets/widgets/qdockwidget.cpp b/src/widgets/widgets/qdockwidget.cpp
index e17c2c1f4c4..84cb78a4746 100644
--- a/src/widgets/widgets/qdockwidget.cpp
+++ b/src/widgets/widgets/qdockwidget.cpp
@@ -160,9 +160,13 @@ bool QDockWidgetTitleButton::event(QEvent *event)
 static inline bool isWindowsStyle(const QStyle *style)
 {
     // Note: QStyleSheetStyle inherits QWindowsStyle
-    const QStyle *effectiveStyle = style->inherits("QStyleSheetStyle")
-        ? static_cast<const QStyleSheetStyle *>(style)->baseStyle()
-        : style;
+    const QStyle *effectiveStyle = style;
+
+#if QT_CONFIG(style_stylesheet)
+    if (style->inherits("QStyleSheetStyle"))
+      effectiveStyle = static_cast<const QStyleSheetStyle *>(style)->baseStyle();
+#endif
+
     return effectiveStyle->inherits("QWindowsStyle");
 }