diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/CommonDefinitions.json b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/CommonDefinitions.json
index 1812e9d32be9..cd593bcb39f2 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/CommonDefinitions.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-01-01-preview/CommonDefinitions.json
@@ -391,7 +391,8 @@
         "maxReplicas": {
           "format": "int32",
           "description": "Optional. Maximum number of container replicas. Defaults to 10 if not set.",
-          "type": "integer"
+          "type": "integer",
+          "default": 10
         },
         "rules": {
           "description": "Scaling rules.",
diff --git a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
index f897f792b9bf..af0951645f20 100644
--- a/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
+++ b/specification/app/resource-manager/Microsoft.App/preview/2022-06-01-preview/CommonDefinitions.json
@@ -485,7 +485,8 @@
         "maxReplicas": {
           "format": "int32",
           "description": "Optional. Maximum number of container replicas. Defaults to 10 if not set.",
-          "type": "integer"
+          "type": "integer",
+          "default": 10
         },
         "rules": {
           "description": "Scaling rules.",