diff --git a/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/phy24_config.json b/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/phy24_config.json
index 2a781875b0..31b86a0bc5 100644
--- a/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/phy24_config.json
+++ b/device/arista/x86_64-arista_720dt_48s/Arista-720DT-48S/phy24_config.json
@@ -14,7 +14,7 @@
   ],
   "ports": [
     {
-      "index": 22,
+      "index": 23,
       "mdio_addr": "",
       "system_speed": 1000,
       "system_fec": "none",