--- old/src/jdk.pack/share/native/common-unpack/constants.h	2018-10-08 15:03:27.176498832 -0400
+++ new/src/jdk.pack/share/native/common-unpack/constants.h	2018-10-08 15:03:26.904484528 -0400
@@ -203,7 +203,7 @@
     AO_HAVE_FIELD_FLAGS_HI    = 1<<10,
     AO_HAVE_METHOD_FLAGS_HI   = 1<<11,
     AO_HAVE_CODE_FLAGS_HI     = 1<<12,
-    AO_UNUSED_MBZ             = (-1)<<13, // options bits reserved for future use.
+    AO_UNUSED_MBZ             = (int)((~0U)<<13), // options bits reserved for future use.
 
 #define ARCHIVE_BIT_DO(F) \
          F(AO_HAVE_SPECIAL_FORMATS) \