diff --git a/src/roxy.rs b/src/roxy.rs
index bd80992..f7f6f0d 100644
--- a/src/roxy.rs
+++ b/src/roxy.rs
@@ -6,18 +6,23 @@ use std::{
 
 use crate::error::Error;
 
-pub trait Parse {
-    fn parse(&mut self, path: &str, src: &[u8], dst: &mut Vec<u8>) -> Result<(), Error>;
+pub trait AsParse {
+    fn as_parse(&self) -> &dyn Parse;
+    fn as_parse_mut(&mut self) -> &mut dyn Parse;
+}
 
-    fn as_dyn(&self) -> &dyn Parse where Self: Sized {
+impl<P: Parse> AsParse for P {
+    fn as_parse(&self) -> &dyn Parse {
+        self
+    }
+
+    fn as_parse_mut(&mut self) -> &mut dyn Parse {
         self
     }
 }
 
-impl<P: Parse + 'static> Into<Box<dyn Parse>> for (P,) {
-    fn into(self) -> Box<dyn Parse> {
-        Box::new(self.0)
-    }
+pub trait Parse {
+    fn parse(&mut self, path: &str, src: &[u8], dst: &mut Vec<u8>) -> Result<(), Error>;
 }
 
 pub struct Parser<'a> {
@@ -29,8 +34,8 @@ impl<'a> Parser<'a> {
         Parser { steps: Vec::new() }
     }
 
-    pub fn push<P: Into<&'a mut dyn Parse>>(&mut self, parser: P) {
-        self.steps.push(parser.into());
+    pub fn push<P: AsParse>(&mut self, parser: &'a mut P) {
+        self.steps.push(parser.as_parse_mut());
     }
 }