1 files changed, 4 insertions, 1 deletions
diff --git a/lib/output/json.js b/lib/output/json.js
index a77b45a..f146023 100644
--- a/lib/output/json.js
+++ b/lib/output/json.js
@@ -1,10 +1,13 @@
 var util = require('util');
+var FolderOutput = require('./folder');
 var ConrefsLoader = require('./conrefs');
 var gitbook = require('../gitbook');
 
 function JSONOutput() {
-    ConrefsLoader.apply(this, arguments);
+    FolderOutput.apply(this, arguments);
+    ConrefsLoader.apply(this);
 }
+util.inherits(JSONOutput, FolderOutput);
 util.inherits(JSONOutput, ConrefsLoader);
 
 JSONOutput.prototype.name = 'json';