typo

ssl/ssl.h

diff --git a/ssl/ssl.h b/ssl/ssl.h
index d918956..c6cd6a9 100644
--- a/ssl/ssl.h
+++ b/ssl/ssl.h
@@ -1099,7 +1099,7 @@
 	 */
 	unsigned int max_send_fragment;
 
-#ifndef OPENSSL_ENGINE
+#ifndef OPENSSL_NO_ENGINE
 	/* Engine to pass requests for client certs to
 	 */
 	ENGINE *client_cert_engine;