diff --git a/src/crypto/slow-hash.c b/src/crypto/slow-hash.c
index 11216175f..53628ab18 100644
--- a/src/crypto/slow-hash.c
+++ b/src/crypto/slow-hash.c
@@ -1070,7 +1070,7 @@ union cn_slow_hash_state
 
 STATIC INLINE int check_aes_hw(void)
 {
-#ifdef __APPLE___
+#ifdef __APPLE__
     return 1;
 #else
     static int supported = -1;