diff --git a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/apimanagement.json b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/apimanagement.json
index 584263e68fbe..dfa998dc1f8d 100644
--- a/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/apimanagement.json
+++ b/specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2021-12-01-preview/apimanagement.json
@@ -615,6 +615,7 @@
       "description": "Schema identifier within an API. Must be unique in the current API Management service instance.",
       "minLength": 1,
       "maxLength": 80,
+      "pattern": "^[^*#&+:<>?]+$",
       "x-ms-parameter-location": "method"
     },
     "ServiceNameParameter": {