diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 6ef3a4f163..50745175b4 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -11474,10 +11474,9 @@ void QWidget::setAttribute(Qt::WidgetAttribute attribute, bool on)
         }
         break;
     case Qt::WA_TranslucentBackground:
-        if (on) {
+        if (on)
             setAttribute(Qt::WA_NoSystemBackground);
-            d->updateIsTranslucent();
-        }
+        d->updateIsTranslucent();
 
         break;
     case Qt::WA_AcceptTouchEvents:
diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index 489edb703c..7edca2017d 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -8855,6 +8855,12 @@ void tst_QWidget::translucentWidget()
         QEXPECT_FAIL("", "WinRT: This fails. QTBUG-68297.", Abort);
     QCOMPARE(actual.size(),expected.size());
     QCOMPARE(actual,expected);
+
+    const QWindow *window = label.windowHandle();
+    const QSurfaceFormat translucentFormat = window->requestedFormat();
+    label.setAttribute(Qt::WA_TranslucentBackground, false);
+    const QSurfaceFormat opaqueFormat = window->requestedFormat();
+    QVERIFY(translucentFormat != opaqueFormat);
 }
 
 class MaskResizeTestWidget : public QWidget