1 files changed, 8 insertions, 9 deletions
diff --git a/Xwt.XamMac/Xwt.Mac/NSApplicationInitializer.cs b/Xwt.XamMac/Xwt.Mac/NSApplicationInitializer.cs
index b051f47a..580573c3 100644
--- a/Xwt.XamMac/Xwt.Mac/NSApplicationInitializer.cs
+++ b/Xwt.XamMac/Xwt.Mac/NSApplicationInitializer.cs
@@ -24,23 +24,22 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+using System;
+
 using AppKit;
 
 namespace Xwt.Mac
 {
 	static class NSApplicationInitializer
 	{
+		[ThreadStatic]
+		static bool initialized;
+
 		public static void Initialize ()
 		{
-			var ds = System.Threading.Thread.GetNamedDataSlot ("NSApplication.Initialized");
-			if (System.Threading.Thread.GetData (ds) == null) {
-				System.Threading.Thread.SetData (ds, true);
-
-				// IgnoreMissingAssembliesDuringRegistration is only avalilable in Xamarin.Mac 3.4+
-				// Use reflection to not break builds with older Xamarin.Mac
-				var ignoreMissingAssemblies = typeof (NSApplication).GetField ("IgnoreMissingAssembliesDuringRegistration",
-				                                                               System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Static);
-				ignoreMissingAssemblies?.SetValue (null, true);
+			if (!initialized) {
+				initialized = true;
+				NSApplication.IgnoreMissingAssembliesDuringRegistration = true;
 				NSApplication.Init ();
 			}
 		}