diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2019-12-01/azureFirewall.json b/specification/network/resource-manager/Microsoft.Network/stable/2019-12-01/azureFirewall.json
index 720b7529302e..0f6b7317713c 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2019-12-01/azureFirewall.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2019-12-01/azureFirewall.json
@@ -169,6 +169,8 @@
             "in": "path",
             "required": true,
             "type": "string",
+            "minLength": 1,
+            "maxLength": 56,
             "description": "The name of the Azure Firewall."
           },
           {