diff --git a/src/lib/platform/OSXScreen.mm b/src/lib/platform/OSXScreen.mm
index 02196e3ed..9c622422a 100644
--- a/src/lib/platform/OSXScreen.mm
+++ b/src/lib/platform/OSXScreen.mm
@@ -768,6 +768,7 @@ void OSXScreen::disable()
 
   if (m_eventTapPort) {
     CGEventTapEnable(m_eventTapPort, false);
+    CFMachPortInvalidate(m_eventTapPort);
     CFRelease(m_eventTapPort);
     m_eventTapPort = nullptr;
   }