Permit null ciphers.
diff --git a/ssl/ssl_ciph.c b/ssl/ssl_ciph.c
index 0e9d97a..cb48f36 100644
--- a/ssl/ssl_ciph.c
+++ b/ssl/ssl_ciph.c
@@ -353,7 +353,7 @@
 	mask|=SSL_kDHr|SSL_kDHd|SSL_kEDH|SSL_aDH;
 #endif
 
-#ifndef SSL_ALLOW_ENULL
+#ifdef SSL_FORBID_ENULL
 	mask|=SSL_eNULL;
 #endif