diff --git a/nsock/include/nsock_config.h.in b/nsock/include/nsock_config.h.in
index 4bc334f11..4c1e65a0a 100644
--- a/nsock/include/nsock_config.h.in
+++ b/nsock/include/nsock_config.h.in
@@ -80,6 +80,7 @@
 
 #undef HAVE_NETDB_H
 
+#undef HAVE_OPENSSL
 #undef HAVE_SSL_SET_TLSEXT_HOST_NAME
 
 #undef HAVE_EPOLL