diff --git a/src/core/web_event_factory.cpp b/src/core/web_event_factory.cpp
index 479fc38f89854117c814b4c62b0b55044fd2a107..17c1c75a0db0db993bed04e3290ba7b3643067a0 100644
--- a/src/core/web_event_factory.cpp
+++ b/src/core/web_event_factory.cpp
@@ -1426,7 +1426,9 @@ blink::WebMouseWheelEvent::Phase toBlinkPhase(QWheelEvent *ev)
 {
     switch (ev->phase()) {
     case Qt::NoScrollPhase:
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 12, 0))
     case Qt::ScrollMomentum:
+#endif
         return blink::WebMouseWheelEvent::kPhaseNone;
     case Qt::ScrollBegin:
         return ev->angleDelta().isNull() ? blink::WebMouseWheelEvent::kPhaseMayBegin : blink::WebMouseWheelEvent::kPhaseBegan;