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-rw-r--r--compiler-rt/lib/asan/asan_internal.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler-rt/lib/asan/asan_internal.h b/compiler-rt/lib/asan/asan_internal.h
index eecedd655c6..65c825e920b 100644
--- a/compiler-rt/lib/asan/asan_internal.h
+++ b/compiler-rt/lib/asan/asan_internal.h
@@ -35,9 +35,9 @@ typedef __int64 int64_t;
#endif // _WIN32
// If __WORDSIZE was undefined by the platform, define it in terms of the
-// compiler built-in __LP64__.
+// compiler built-ins __LP64__ and _WIN64.
#ifndef __WORDSIZE
-#if __LP64__
+#if __LP64__ || defined(_WIN64)
#define __WORDSIZE 64
#else
#define __WORDSIZE 32
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