diff --git a/jdk/src/share/native/com/sun/java/util/jar/pack/constants.h b/jdk/src/share/native/com/sun/java/util/jar/pack/constants.h
index f1a1f73edf..b032469f31 100644
--- a/jdk/src/share/native/com/sun/java/util/jar/pack/constants.h
+++ b/jdk/src/share/native/com/sun/java/util/jar/pack/constants.h
@@ -223,7 +223,7 @@ enum {
     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) \