diff --git a/src/babel/transformation/file/options.json b/src/babel/transformation/file/options.json
index d8d4cd42aa..3ebe7b22b6 100644
--- a/src/babel/transformation/file/options.json
+++ b/src/babel/transformation/file/options.json
@@ -127,7 +127,7 @@
   },
 
   "compact": {
-    "type": "booleanstring",
+    "type": "booleanString",
     "default": "auto",
     "description": "do not include superfluous whitespace characters and line terminators [true|false|auto]"
   },