diff --git a/packages/gatsby-transformer-sharp/src/customize-schema.js b/packages/gatsby-transformer-sharp/src/customize-schema.js
index 262e5c8a04385..14baeed0fa9db 100644
--- a/packages/gatsby-transformer-sharp/src/customize-schema.js
+++ b/packages/gatsby-transformer-sharp/src/customize-schema.js
@@ -465,7 +465,6 @@ 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: [``, `webp`],
       },
       outputPixelDensities: {
         type: GraphQLList(GraphQLFloat),