diff --git a/yang/clixon-config@2018-04-30.yang b/yang/clixon-config@2018-04-30.yang
index c629a3c7..164d108b 100644
--- a/yang/clixon-config@2018-04-30.yang
+++ b/yang/clixon-config@2018-04-30.yang
@@ -248,7 +248,6 @@ module clixon-config {
 	}
 	leaf CLICON_SOCK {
 	    type string;
-	    mandatory true;
 	    description
 		"If family above is AF_UNIX: Unix socket for communicating 
        	         with clixon_backend. If family is AF_INET: IPv4 address";