diff --git a/crypto/bn/bn_nist.c b/crypto/bn/bn_nist.c
index 3e3caae08..9f12f06fa 100644
--- a/crypto/bn/bn_nist.c
+++ b/crypto/bn/bn_nist.c
@@ -364,7 +364,7 @@ static void nist_cp_bn(BN_ULONG *buf, const BN_ULONG *a, int top)
 #define bn_32_set_0(to, n)		(to)[n] = (BN_ULONG)0;
 # if defined(_WIN32) && !defined(__GNUC__)
 #  define NIST_INT64 __int64
-# else
+# elif defined(BN_LLONG)
 #  define NIST_INT64 long long
 # endif
 #endif /* BN_BITS2 != 64 */