diff --git a/Cryptlib/Include/openssl/opensslconf.h b/Cryptlib/Include/openssl/opensslconf.h
index 1917d7a..68a2603 100644
--- a/Cryptlib/Include/openssl/opensslconf.h
+++ b/Cryptlib/Include/openssl/opensslconf.h
@@ -59,6 +59,9 @@ extern "C" {
 #ifndef OPENSSL_NO_MD2
 # define OPENSSL_NO_MD2
 #endif
+#ifndef OPENSSL_NO_MD4
+# define OPENSSL_NO_MD4
+#endif
 #ifndef OPENSSL_NO_MDC2
 # define OPENSSL_NO_MDC2
 #endif