diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 5edc7223b1..2fbaec2c56 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -1240,7 +1240,9 @@ void QCocoaWindow::windowDidOrderOffScreen()
 
 void QCocoaWindow::windowDidChangeOcclusionState()
 {
-    if (m_view.window.occlusionState & NSWindowOcclusionStateVisible)
+    bool visible = m_view.window.occlusionState & NSWindowOcclusionStateVisible;
+    qCDebug(lcQpaWindow) << "QCocoaWindow::windowDidChangeOcclusionState" << window() << "is now" << (visible ? "visible" : "occluded");
+    if (visible)
         [m_view setNeedsDisplay:YES];
     else
         handleExposeEvent(QRegion());