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-rw-r--r--js/src/jstypes.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/js/src/jstypes.h b/js/src/jstypes.h
index 6cfb3d4ad..04ffbe00d 100644
--- a/js/src/jstypes.h
+++ b/js/src/jstypes.h
@@ -147,7 +147,7 @@
# define JS_64BIT
# endif
#elif defined(__GNUC__)
-# if defined(__x86_64__) || defined(__64BIT__)
+# if defined(__x86_64__) || defined(__LP64__)
# define JS_64BIT
# endif
#elif defined(__xlc__) || defined(__xlC__) /* IBM XL C/C++ */