diff --git a/Makefile.ctr b/Makefile.ctr
index 7080b7fb9c..4b1318aadf 100644
--- a/Makefile.ctr
+++ b/Makefile.ctr
@@ -77,6 +77,7 @@ else
 	#HAVE_SOCKET_LEGACY = 1
 	#HAVE_THREADS = 1
 	#HAVE_SSL = 1
+	#HAVE_BUILTINMBEDTLS = 1
 
 	include Makefile.common
 	BLACKLIST :=