diff --git a/src/babel/util.js b/src/babel/util.js
index e9c023944c..56f83e5e6a 100644
--- a/src/babel/util.js
+++ b/src/babel/util.js
@@ -59,7 +59,7 @@ export function arrayify(val: any): Array {
 export function booleanify(val: any): boolean {
   if (val === "true") return true;
   if (val === "false") return false;
-  return !!val;
+  return val;
 }
 
 var templateVisitor = {