diff --git a/src/yang/etsi-nfv-vnf.yang b/src/yang/etsi-nfv-vnf.yang
index d8fda8b74306ae5e34614d2c8f45b693c02b5b79..e24924a24fc3e8f38958c46c3025152ac562ec32 100755
--- a/src/yang/etsi-nfv-vnf.yang
+++ b/src/yang/etsi-nfv-vnf.yang
@@ -70,6 +70,7 @@ submodule etsi-nfv-vnf {
       list network-interface-requirements {
         key "key";
         min-elements "1";
+        max-elements "1";
 
         leaf key {
           type string;