diff --git a/simple-store.go b/simple-store.go
index 6dcd188..737671f 100644
--- a/simple-store.go
+++ b/simple-store.go
@@ -25,7 +25,7 @@ func NewSimpleStore() *SimpleStore {
 }
 
 func filterRefName(name string) bool  { return name[0] != '@' }
-func filterPrivName(name string) bool { return name[0] != '_' }
+//func filterPrivName(name string) bool { return name[0] != '_' }
 
 func (ctx *SimpleStore) SetParent(parentCtx ExprContext) {
 	ctx.parent = parentCtx