diff --git a/ChangeLog b/ChangeLog
index b2eee1baa..575b0e714 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2010-03-03 Doug Simons <doug.simons@testplant.com>
+
+	* Source/ObjectiveC2/sync.m: Avoid crash on Windows.
+
 2010-03-25 Riccardo Mottola <rmottola@users.sf.net>
 
 	* Source/GSPThread.h
diff --git a/Source/ObjectiveC2/sync.m b/Source/ObjectiveC2/sync.m
index 6ecf27534..8b7f9ef4a 100644
--- a/Source/ObjectiveC2/sync.m
+++ b/Source/ObjectiveC2/sync.m
@@ -102,7 +102,9 @@ deallocLockClass(id obj, SEL _cmd)
 
   pthread_mutex_destroy(lock);
   // Free the class
+#ifndef __MINGW32__
   objc_disposeClassPair(lockClass);
+#endif
   // Reset the class then call the real -dealloc
   obj->isa = realClass;
   [obj dealloc];