diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
index f6c6c78b0d7b..0061f43f02ce 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/LinkedService.json
@@ -2706,8 +2706,8 @@
           "description": "This value specifies the endpoint to access with the S3 Connector. This is an optional property; change it only if you want to try a different service endpoint or want to switch between https and http. Type: string (or Expression with resultType string)."
         },
         "sessionToken": {
-          "type": "object",
-          "description": "The session token for the S3 temporary security credential. Type: string (or Expression with resultType string)."
+          "$ref": "../datafactory.json#/definitions/SecretBase",
+          "description": "The session token for the S3 temporary security credential."
         },
         "encryptedCredential": {
           "type": "object",