diff --git a/src/openssl.c b/src/openssl.c
index 473337c..1af3bcd 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -201,7 +201,7 @@ _libssh2_cipher_crypt(_libssh2_cipher_ctx * ctx,
     return ret == 1 ? 0 : 1;
 }
 
-#if defined(LIBSSH2_AES_CTR) && !defined(HAVE_EVP_AES128_CTR)
+#if LIBSSH2_AES_CTR && !defined(HAVE_EVP_AES128_CTR)
 
 #include <openssl/aes.h>