diff --git a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
index af27b61b9b7f..927908763d29 100644
--- a/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
+++ b/specification/containerinstance/resource-manager/Microsoft.ContainerInstance/stable/2021-10-01/containerInstance.json
@@ -1477,8 +1477,7 @@
         }
       },
       "required": [
-        "server",
-        "username"
+        "server"
       ]
     },
     "ContainerGroupDiagnostics": {