diff --git a/src/Cockpit/NavDisplay.cxx b/src/Cockpit/NavDisplay.cxx
index d2182eaee..504cf97f5 100644
--- a/src/Cockpit/NavDisplay.cxx
+++ b/src/Cockpit/NavDisplay.cxx
@@ -183,7 +183,7 @@ private:
 class SymbolRule
 {
 public:
-  SymbolRule()
+  SymbolRule() : enabled(false)
     {
         
     }
diff --git a/src/Input/FGMacOSXEventInput.cxx b/src/Input/FGMacOSXEventInput.cxx
index eaf451108..517322e17 100644
--- a/src/Input/FGMacOSXEventInput.cxx
+++ b/src/Input/FGMacOSXEventInput.cxx
@@ -229,9 +229,6 @@ void FGMacOSXEventInput::shutdown()
 {
     FGEventInput::shutdown();
 
-    IOHIDManagerRegisterDeviceMatchingCallback(d->hidManager, nullptr, nullptr);
-    IOHIDManagerRegisterDeviceRemovalCallback(d->hidManager, nullptr, nullptr);
-
     IOHIDManagerClose(d->hidManager, kIOHIDOptionsTypeNone);
     IOHIDManagerUnscheduleFromRunLoop(d->hidManager, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
     CFRelease(d->hidManager);