diff --git a/lib/process.js b/lib/process.js
index ad8f1246..bdd00e37 100644
--- a/lib/process.js
+++ b/lib/process.js
@@ -131,7 +131,7 @@ module.exports = function(src, filename, config) {
     output.renderFnStartLine,
     output.renderFnEndLine,
     templateLine
-  )
+  ).toJSON()
 
   return {
     code: output.code,