diff --git a/src/plugins/bearer/corewlan/qcorewlanengine.mm b/src/plugins/bearer/corewlan/qcorewlanengine.mm
index 341d3bccf2..3368234c26 100644
--- a/src/plugins/bearer/corewlan/qcorewlanengine.mm
+++ b/src/plugins/bearer/corewlan/qcorewlanengine.mm
@@ -287,7 +287,7 @@ void QScanThread::getUserConfigurations()
     QMacAutoReleasePool pool;
     userProfiles.clear();
 
-    NSArray<NSString *> *wifiInterfaces = [CWWiFiClient interfaceNames];
+    NSArray *wifiInterfaces = [CWWiFiClient interfaceNames];
     for (NSString *ifName in wifiInterfaces) {
 
         CWInterface *wifiInterface = [[CWWiFiClient sharedWiFiClient] interfaceWithName:ifName];
@@ -602,7 +602,7 @@ void QCoreWlanEngine::doRequestUpdate()
 
     QMacAutoReleasePool pool;
 
-    NSArray<NSString *> *wifiInterfaces = [CWWiFiClient interfaceNames];
+    NSArray *wifiInterfaces = [CWWiFiClient interfaceNames];
     for (NSString *ifName in wifiInterfaces) {
             scanThread->interfaceName = QString::fromNSString(ifName);
             scanThread->start();
diff --git a/src/plugins/platforms/cocoa/qcocoascreen.mm b/src/plugins/platforms/cocoa/qcocoascreen.mm
index a17a02b629..d76c42fa03 100644
--- a/src/plugins/platforms/cocoa/qcocoascreen.mm
+++ b/src/plugins/platforms/cocoa/qcocoascreen.mm
@@ -114,7 +114,7 @@ void QCocoaScreen::updateGeometry()
         return;

     // The reference screen for the geometry is always the primary screen
-    QRectF primaryScreenGeometry = QRectF::fromCGRect([[NSScreen screens] firstObject].frame);
+    QRectF primaryScreenGeometry = QRectF::fromCGRect([[[NSScreen screens] firstObject] frame]);
     m_geometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.frame), primaryScreenGeometry).toRect();
     m_availableGeometry = qt_mac_flip(QRectF::fromCGRect(nsScreen.visibleFrame), primaryScreenGeometry).toRect();

diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index 72f3bc0075..a9c058a850 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -1676,7 +1676,7 @@ void QCocoaWindow::applyContentBorderThickness(NSWindow *window)
 
     if (!m_drawContentBorderGradient) {
         window.styleMask = window.styleMask & ~NSTexturedBackgroundWindowMask;
-        [window.contentView.superview setNeedsDisplay:YES];
+        [[window.contentView superview] setNeedsDisplay:YES];
         window.titlebarAppearsTransparent = NO;
         return;
     }
diff --git a/src/plugins/platforms/cocoa/qnswindow.mm b/src/plugins/platforms/cocoa/qnswindow.mm
index cb13b7d184..0159d68dca 100644
--- a/src/plugins/platforms/cocoa/qnswindow.mm
+++ b/src/plugins/platforms/cocoa/qnswindow.mm
@@ -231,7 +231,7 @@ static bool isMouseEvent(NSEvent *ev)
     if (pw->frameStrutEventsEnabled() && isMouseEvent(theEvent)) {
         NSPoint loc = [theEvent locationInWindow];
         NSRect windowFrame = [self convertRectFromScreen:self.frame];
-        NSRect contentFrame = self.contentView.frame;
+        NSRect contentFrame = [self.contentView frame];
         if (NSMouseInRect(loc, windowFrame, NO) && !NSMouseInRect(loc, contentFrame, NO))
             [qnsview_cast(pw->view()) handleFrameStrutMouseEvent:theEvent];
     }
@@ -260,7 +260,7 @@ static bool isMouseEvent(NSEvent *ev)
 + (void)applicationActivationChanged:(NSNotification*)notification
 {
     const id sender = self;
-    NSEnumerator<NSWindow*> *windowEnumerator = nullptr;
+    NSEnumerator *windowEnumerator = nullptr;
     NSApplication *application = [NSApplication sharedApplication];
 
 #if QT_MACOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_12)