diff --git a/ext/standard/crypt_blowfish.c b/ext/standard/crypt_blowfish.c
index f470b66609f..b640a1081b6 100644
--- a/ext/standard/crypt_blowfish.c
+++ b/ext/standard/crypt_blowfish.c
@@ -54,7 +54,7 @@
 #ifdef __i386__
 #define BF_ASM				0
 #define BF_SCALE			1
-#elif defined(__alpha__) || defined(__hppa__)
+#elif defined(__x86_64__) || defined(__alpha__) || defined(__hppa__)
 #define BF_ASM				0
 #define BF_SCALE			1
 #else