diff --git a/src/plugins/platforms/cocoa/qnsview_mouse.mm b/src/plugins/platforms/cocoa/qnsview_mouse.mm
index 0857c9b1ca..75d9f9ab11 100644
--- a/src/plugins/platforms/cocoa/qnsview_mouse.mm
+++ b/src/plugins/platforms/cocoa/qnsview_mouse.mm
@@ -209,16 +209,15 @@ static const QPointingDevice *pointingDeviceFor(qint64 deviceID)
         case NSEventTypeOtherMouseUp:
             return QEvent::NonClientAreaMouseButtonRelease;
 
+        case NSEventTypeMouseMoved:
         case NSEventTypeLeftMouseDragged:
         case NSEventTypeRightMouseDragged:
         case NSEventTypeOtherMouseDragged:
             return QEvent::NonClientAreaMouseMove;
 
         default:
-            break;
+            Q_UNREACHABLE();
         }
-
-        return QEvent::None;
     }();
 
     qCInfo(lcQpaMouse) << eventType << "at" << qtWindowPoint << "with" << m_frameStrutButtons << "in" << self.window;