diff --git a/src/babel/transformation/file/options.json b/src/babel/transformation/file/options.json
index 3aab927529..e127a69a48 100644
--- a/src/babel/transformation/file/options.json
+++ b/src/babel/transformation/file/options.json
@@ -47,6 +47,7 @@
   },
 
   "experimental": {
+    "type": "boolean",
     "description": "allow use of experimental transformers",
     "default": false
   },