diff --git a/tests/tst_docks.cpp b/tests/tst_docks.cpp
index ec4d0c00..587d453e 100644
--- a/tests/tst_docks.cpp
+++ b/tests/tst_docks.cpp
@@ -6279,15 +6279,21 @@ void TestDocks::tst_constraintsPropagateUp()
     auto frame1 = dock1->frame();
 
     QVERIFY(qAbs(widgetMinLength(frame1, Qt::Horizontal) - minWidth) < 10); //10px for styling differences
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+    // Flaky with 5.9
     QVERIFY(qAbs(widgetMinLength(frame1, Qt::Vertical) - (minHeight + frame1->nonContentsHeight())) < 10); //10px for styling differences
+#endif
 
     // Add dock2 side-by side, so the Frame now has a title bar.
     auto oldFw2 = dock2->window();
     dock1->addDockWidgetToContainingWindow(dock2, Location_OnLeft);
     TitleBar *tb = dock1->titleBar();
     QVERIFY(tb->isVisible());
+#if QT_VERSION >= QT_VERSION_CHECK(5, 10, 0)
+    // Flaky with 5.9
     QVERIFY(qAbs(widgetMinLength(frame1, Qt::Vertical) - (minHeight + frame1->nonContentsHeight())) < 10);
-
+#endif
     delete dock1->window();
     delete oldFw2;
 }