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-rw-r--r--include/ruby/internal/memory.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 8f00787512..3bd54cd6c7 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -38,7 +38,7 @@
# include <alloca.h>
#endif
-#if defined(_MSC_VER) && defined(_WIN64)
+#if defined(_MSC_VER) && defined(_M_AMD64)
# include <intrin.h>
# pragma intrinsic(_umul128)
#endif