1 files changed, 1 insertions, 1 deletions
diff --git a/src/trex_port_attr.h b/src/trex_port_attr.h
index eb7c85de..95050d1b 100755
--- a/src/trex_port_attr.h
+++ b/src/trex_port_attr.h
@@ -126,7 +126,7 @@ public:
             if (is_resolved()) {
                 output["arp"] = utl_macaddr_to_str(m_mac);
             } else {
-                output["arp"] = "none";
+                output["arp"] = Json::nullValue;
             }
             break;