diff --git a/packages/gatsby-source-contentful/src/extend-node-type.js b/packages/gatsby-source-contentful/src/extend-node-type.js
index 11aaa30e412b4..ca87598d2ab1c 100644
--- a/packages/gatsby-source-contentful/src/extend-node-type.js
+++ b/packages/gatsby-source-contentful/src/extend-node-type.js
@@ -802,6 +802,9 @@ exports.extendNodeType = ({ type, store }) => {
 
     fieldConfig.type = GraphQLJSON
 
+    fieldConfig.args.placeholder.defaultValue = `dominantColor`
+    fieldConfig.args.layout.defaultValue = `constrained`
+
     return fieldConfig
   }