diff --git a/src/plugins/styles/mac/qmacstyle_mac.mm b/src/plugins/styles/mac/qmacstyle_mac.mm
index 30e729202f8..20530e067bc 100644
--- a/src/plugins/styles/mac/qmacstyle_mac.mm
+++ b/src/plugins/styles/mac/qmacstyle_mac.mm
@@ -3024,7 +3024,7 @@ void QMacStyle::drawPrimitive(PrimitiveElement pe, const QStyleOption *opt, QPai
         }
         d->drawNSViewInRect(box, adjustedRect, p, ^(CGContextRef ctx, const CGRect &rect) {
 #if QT_CONFIG(tabwidget)
-            if (QTabWidget *tabWidget = qobject_cast<QTabWidget *>(opt->styleObject))
+            if (qobject_cast<QTabWidget *>(opt->styleObject))
                 clipTabBarFrame(opt, this, ctx);
 #endif
             CGContextTranslateCTM(ctx, 0, rect.origin.y + rect.size.height);