1 files changed, 2 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_lcl.h b/src/lib/libcrypto/bn/bn_lcl.h
index 27ac4397a1..8e5e98e3f2 100644
--- a/src/lib/libcrypto/bn/bn_lcl.h
+++ b/src/lib/libcrypto/bn/bn_lcl.h
@@ -255,7 +255,8 @@ extern "C" {
              : "r"(a), "r"(b));         \
         ret;                    })
 #  endif        /* compiler */
-# elif defined(__x86_64) && defined(SIXTY_FOUR_BIT_LONG)
+# elif (defined(__x86_64) || defined(__x86_64__)) && \
+       (defined(SIXTY_FOUR_BIT_LONG) || defined(SIXTY_FOUR_BIT))
 #  if defined(__GNUC__)
 #   define BN_UMULT_HIGH(a,b)   ({      \
         register BN_ULONG ret,discard;  \