diff --git a/src/codec/decoder/mod.rs b/src/codec/decoder/mod.rs
index 8dbd62e..452caa4 100644
--- a/src/codec/decoder/mod.rs
+++ b/src/codec/decoder/mod.rs
@@ -18,7 +18,7 @@ pub use self::check::Check;
 use std::ffi::CString;
 use std::ptr;
 use std::slice::from_raw_parts;
-use std::ops::Deref;
+use std::ops::{Deref, DerefMut};
 
 use ffi::*;
 use super::{Id, Profile};
@@ -113,6 +113,12 @@ impl Deref for Decoder {
 	}
 }
 
+impl DerefMut for Decoder {
+	fn deref_mut(&mut self) -> &mut<Self as Deref>::Target {
+		&mut self.0
+	}
+}
+
 pub fn find(id: Id) -> Option<Codec<'static>> {
 	unsafe {
 		let ptr = avcodec_find_decoder(id.into());