diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.h b/src/plugins/platforms/cocoa/qcocoaintegration.h
index 7831888da16..8620ef4267b 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.h
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.h
@@ -125,7 +125,7 @@ public:
     QList<int> possibleKeys(const QKeyEvent *event) const;
 
     void updateScreens();
-    QCocoaScreen *screenAtIndex(int index) const { return mScreens.at(index); }
+    QCocoaScreen *screenAtIndex(int index);
 
 private:
 
diff --git a/src/plugins/platforms/cocoa/qcocoaintegration.mm b/src/plugins/platforms/cocoa/qcocoaintegration.mm
index fad743439e3..5f0ad242412 100644
--- a/src/plugins/platforms/cocoa/qcocoaintegration.mm
+++ b/src/plugins/platforms/cocoa/qcocoaintegration.mm
@@ -343,6 +343,14 @@ void QCocoaIntegration::updateScreens()
         screen->setVirtualSiblings(siblings);
 }
 
+QCocoaScreen *QCocoaIntegration::screenAtIndex(int index)
+{
+    if (index >= mScreens.count())
+        updateScreens();
+
+    return mScreens.at(index);
+}
+
 bool QCocoaIntegration::hasCapability(QPlatformIntegration::Capability cap) const
 {
     switch (cap) {