diff --git a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
index 6b1a78bc2a1a..ce5a8a1e5e97 100644
--- a/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
+++ b/specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json
@@ -6850,8 +6850,11 @@
         },
         "headers": {
           "type": "object",
-          "x-ms-format": "dfe-string",
-          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
+          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string).",
+          "additionalProperties": {
+            "type": "string",
+            "x-ms-format": "dfe-string"
+          }
         },
         "body": {
           "type": "object",
@@ -7880,8 +7883,11 @@
         },
         "headers": {
           "type": "object",
-          "x-ms-format": "dfe-string",
-          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
+          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string).",
+          "additionalProperties": {
+            "type": "string",
+            "x-ms-format": "dfe-string"
+          }
         },
         "body": {
           "type": "object",
@@ -7946,8 +7952,11 @@
         },
         "headers": {
           "type": "object",
-          "x-ms-format": "dfe-string",
-          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
+          "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string).",
+          "additionalProperties": {
+            "type": "string",
+            "x-ms-format": "dfe-string"
+          }
         },
         "body": {
           "type": "object",