diff --git a/packages/gatsby-transformer-sharp/src/customize-schema.js b/packages/gatsby-transformer-sharp/src/customize-schema.js
index eb55d5f43d79d..00cb78af3a3e8 100644
--- a/packages/gatsby-transformer-sharp/src/customize-schema.js
+++ b/packages/gatsby-transformer-sharp/src/customize-schema.js
@@ -453,7 +453,6 @@ const imageNodeType = ({
         not know the formats of the source images, as this could lead to unwanted results such as converting JPEGs to PNGs. Specifying 
         both PNG and JPG is not supported and will be ignored.
         `,
-        defaultValue: [`auto`, `webp`],
       },
       outputPixelDensities: {
         type: GraphQLList(GraphQLFloat),