diff --git a/native/Avalonia.Native/src/OSX/platformthreading.mm b/native/Avalonia.Native/src/OSX/platformthreading.mm
index f93436d157..e83bf53331 100644
--- a/native/Avalonia.Native/src/OSX/platformthreading.mm
+++ b/native/Avalonia.Native/src/OSX/platformthreading.mm
@@ -101,7 +101,7 @@ public:
     
     virtual bool GetCurrentThreadIsLoopThread() override
     {
-        return [[NSThread currentThread] isMainThread];
+        return [NSThread isMainThread];
     }
     virtual void SetSignaledCallback(IAvnSignaledCallback* cb) override
     {
diff --git a/src/Avalonia.Native/Extensions.cs b/src/Avalonia.Native/Extensions.cs
new file mode 100644
index 0000000000..c0d90f7a85
--- /dev/null
+++ b/src/Avalonia.Native/Extensions.cs
@@ -0,0 +1,8 @@
+namespace Avalonia.Native
+{
+    internal static class Extensions
+    {
+        public static int AsComBool(this bool b) => b ? 1 : 0;
+        public static bool FromComBool(this int b) => b != 0;
+    }
+}
diff --git a/src/Avalonia.Native/IAvnMenuItem.cs b/src/Avalonia.Native/IAvnMenuItem.cs
index e2feffaa33..4c0c81394f 100644
--- a/src/Avalonia.Native/IAvnMenuItem.cs
+++ b/src/Avalonia.Native/IAvnMenuItem.cs
@@ -24,7 +24,7 @@ namespace Avalonia.Native.Interop.Impl
 
         private void UpdateTitle(string title) => SetTitle(title ?? "");
 
-        private void UpdateIsChecked(bool isChecked) => SetIsChecked(isChecked);
+        private void UpdateIsChecked(bool isChecked) => SetIsChecked(isChecked.AsComBool());
 
         private void UpdateToggleType(NativeMenuItemToggleType toggleType)
         {
diff --git a/src/Avalonia.Native/PlatformThreadingInterface.cs b/src/Avalonia.Native/PlatformThreadingInterface.cs
index df69f2eafb..882d5a2ed3 100644
--- a/src/Avalonia.Native/PlatformThreadingInterface.cs
+++ b/src/Avalonia.Native/PlatformThreadingInterface.cs
@@ -33,9 +33,9 @@ namespace Avalonia.Native
                 _parent = parent;
             }
 
-            public void Signaled(int priority, bool priorityContainsMeaningfulValue)
+            public void Signaled(int priority, int priorityContainsMeaningfulValue)
             {
-                _parent.Signaled?.Invoke(priorityContainsMeaningfulValue ? (DispatcherPriority?)priority : null);
+                _parent.Signaled?.Invoke(priorityContainsMeaningfulValue.FromComBool() ? (DispatcherPriority?)priority : null);
             }
         }
 
@@ -50,7 +50,7 @@ namespace Avalonia.Native
                 _native.SetSignaledCallback(cb);
         }
 
-        public bool CurrentThreadIsLoopThread => _native.CurrentThreadIsLoopThread;
+        public bool CurrentThreadIsLoopThread => _native.CurrentThreadIsLoopThread.FromComBool();
 
         public event Action<DispatcherPriority?> Signaled;
 
diff --git a/src/Avalonia.Native/PopupImpl.cs b/src/Avalonia.Native/PopupImpl.cs
index 2f98385038..60c552a937 100644
--- a/src/Avalonia.Native/PopupImpl.cs
+++ b/src/Avalonia.Native/PopupImpl.cs
@@ -50,9 +50,9 @@ namespace Avalonia.Native
                 // NOP on Popup
             }
 
-            bool IAvnWindowEvents.Closing()
+            int IAvnWindowEvents.Closing()
             {
-                return true;
+                return true.AsComBool();
             }
 
             void IAvnWindowEvents.WindowStateChanged(AvnWindowState state)
diff --git a/src/Avalonia.Native/PredicateCallback.cs b/src/Avalonia.Native/PredicateCallback.cs
index 1ed2ae36af..19c470bcb3 100644
--- a/src/Avalonia.Native/PredicateCallback.cs
+++ b/src/Avalonia.Native/PredicateCallback.cs
@@ -12,9 +12,9 @@ namespace Avalonia.Native
             _predicate = predicate;
         }
 
-        bool IAvnPredicateCallback.Evaluate()
+        int IAvnPredicateCallback.Evaluate()
         {
-            return _predicate();
+            return _predicate().AsComBool();
         }
     }
 }
diff --git a/src/Avalonia.Native/ScreenImpl.cs b/src/Avalonia.Native/ScreenImpl.cs
index ae6da01388..7b4a001486 100644
--- a/src/Avalonia.Native/ScreenImpl.cs
+++ b/src/Avalonia.Native/ScreenImpl.cs
@@ -33,7 +33,7 @@ namespace Avalonia.Native
                             screen.PixelDensity,
                             screen.Bounds.ToAvaloniaPixelRect(),
                             screen.WorkingArea.ToAvaloniaPixelRect(),
-                            screen.Primary);
+                            screen.Primary.FromComBool());
                     }
 
                     return result;
diff --git a/src/Avalonia.Native/SystemDialogs.cs b/src/Avalonia.Native/SystemDialogs.cs
index 0239fc680d..8012813644 100644
--- a/src/Avalonia.Native/SystemDialogs.cs
+++ b/src/Avalonia.Native/SystemDialogs.cs
@@ -26,7 +26,7 @@ namespace Avalonia.Native
             if (dialog is OpenFileDialog ofd)
             {
                 _native.OpenFileDialog(nativeParent,
-                                        events, ofd.AllowMultiple,
+                                        events, ofd.AllowMultiple.AsComBool(),
                                         ofd.Title ?? "",
                                         ofd.Directory ?? "",
                                         ofd.InitialFileName ?? "",
diff --git a/src/Avalonia.Native/WindowImpl.cs b/src/Avalonia.Native/WindowImpl.cs
index b42831854d..f60e83efe3 100644
--- a/src/Avalonia.Native/WindowImpl.cs
+++ b/src/Avalonia.Native/WindowImpl.cs
@@ -42,14 +42,14 @@ namespace Avalonia.Native
                 _parent = parent;
             }
 
-            bool IAvnWindowEvents.Closing()
+            int IAvnWindowEvents.Closing()
             {
                 if (_parent.Closing != null)
                 {
-                    return _parent.Closing();
+                    return _parent.Closing().AsComBool();
                 }
 
-                return true;
+                return true.AsComBool();
             }
 
             void IAvnWindowEvents.WindowStateChanged(AvnWindowState state)
@@ -69,7 +69,7 @@ namespace Avalonia.Native
 
         public void CanResize(bool value)
         {
-            _native.SetCanResize(value);
+            _native.SetCanResize(value.AsComBool());
         }
 
         public void SetSystemDecorations(Controls.SystemDecorations enabled)
@@ -145,7 +145,7 @@ namespace Avalonia.Native
         {
             _isExtended = extendIntoClientAreaHint;
 
-            _native.SetExtendClientArea(extendIntoClientAreaHint);
+            _native.SetExtendClientArea(extendIntoClientAreaHint.AsComBool());
 
             InvalidateExtendedMargins();
         }
@@ -198,7 +198,7 @@ namespace Avalonia.Native
 
         public void SetEnabled(bool enable)
         {
-            _native.SetEnabled(enable);
+            _native.SetEnabled(enable.AsComBool());
         }
     }
 }
diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index 150ab2703e..88c3144884 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -192,14 +192,14 @@ namespace Avalonia.Native
                 _parent.RawMouseEvent(type, timeStamp, modifiers, point, delta);
             }
 
-            bool IAvnWindowBaseEvents.RawKeyEvent(AvnRawKeyEventType type, uint timeStamp, AvnInputModifiers modifiers, uint key)
+            int IAvnWindowBaseEvents.RawKeyEvent(AvnRawKeyEventType type, uint timeStamp, AvnInputModifiers modifiers, uint key)
             {
-                return _parent.RawKeyEvent(type, timeStamp, modifiers, key);
+                return _parent.RawKeyEvent(type, timeStamp, modifiers, key).AsComBool();
             }
 
-            bool IAvnWindowBaseEvents.RawTextInputEvent(uint timeStamp, string text)
+            int IAvnWindowBaseEvents.RawTextInputEvent(uint timeStamp, string text)
             {
-                return _parent.RawTextInputEvent(timeStamp, text);
+                return _parent.RawTextInputEvent(timeStamp, text).AsComBool();
             }
 
 
@@ -388,7 +388,7 @@ namespace Avalonia.Native
 
         public void SetTopmost(bool value)
         {
-            _native.SetTopMost(value);
+            _native.SetTopMost(value.AsComBool());
         }
 
         public double RenderScaling => _native?.Scaling ?? 1;
@@ -456,7 +456,7 @@ namespace Avalonia.Native
 
                 TransparencyLevel = transparencyLevel;
 
-                _native?.SetBlurEnabled(TransparencyLevel >= WindowTransparencyLevel.Blur);
+                _native?.SetBlurEnabled((TransparencyLevel >= WindowTransparencyLevel.Blur).AsComBool());
                 TransparencyLevelChanged?.Invoke(TransparencyLevel);
             }
         }
diff --git a/src/Avalonia.Native/avn.idl b/src/Avalonia.Native/avn.idl
index 1d36cce20d..3f33476c3d 100644
--- a/src/Avalonia.Native/avn.idl
+++ b/src/Avalonia.Native/avn.idl
@@ -1,5 +1,6 @@
 @clr-namespace Avalonia.Native.Interop
 @clr-access internal
+@clr-map bool int
 @cpp-preamble @@
 #include "com.h"
 #include "key.h"