diff --git a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2023-02-01-preview/machineLearningServices.json b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2023-02-01-preview/machineLearningServices.json
index 58bfa1399110..3b55c002a81a 100644
--- a/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2023-02-01-preview/machineLearningServices.json
+++ b/specification/machinelearningservices/resource-manager/Microsoft.MachineLearningServices/preview/2023-02-01-preview/machineLearningServices.json
@@ -1979,6 +1979,7 @@
       "in": "path",
       "type": "string",
       "required": true,
+      "pattern": "^[a-zA-Z0-9][a-zA-Z0-9_-]{2,32}$",
       "x-ms-parameter-location": "method"
     },
     "ComputeNameParameter": {