diff -up ./native/dispatch.c.old ./native/dispatch.c
--- ./native/dispatch.c.old	2010-05-12 09:56:55.478872622 +0200
+++ ./native/dispatch.c	2010-05-12 09:57:11.639872467 +0200
@@ -2808,7 +2808,7 @@ Java_com_sun_jna_Native_unregister(JNIEn
     free(md);
   }
   (*env)->ReleaseLongArrayElements(env, handles, data, 0);
-  (*env)->UnregisterNatives(env, cls);
+  //(*env)->UnregisterNatives(env, cls);
 }
 
 JNIEXPORT jlong JNICALL