diff --git a/packages/core/core/src/ParcelConfig.schema.js b/packages/core/core/src/ParcelConfig.schema.js
index 1010154c7fb..34d13f5722b 100644
--- a/packages/core/core/src/ParcelConfig.schema.js
+++ b/packages/core/core/src/ParcelConfig.schema.js
@@ -93,6 +93,9 @@ const mapStringSchema = (pluginType: string, key: string): SchemaEntity => {
 export default {
   type: 'object',
   properties: {
+    $schema: {
+      type: 'string',
+    },
     extends: {
       oneOf: [
         {