diff --git a/src/codec/encoder/mod.rs b/src/codec/encoder/mod.rs
index 9c9e89a..18ae64b 100644
--- a/src/codec/encoder/mod.rs
+++ b/src/codec/encoder/mod.rs
@@ -21,7 +21,7 @@ pub use self::decision::Decision;
 
 use std::ffi::CString;
 use std::ptr;
-use std::ops::Deref;
+use std::ops::{Deref, DerefMut};
 
 use libc::c_int;
 use ffi::*;
@@ -104,6 +104,12 @@ impl Deref for Encoder {
 	}
 }
 
+impl DerefMut for Encoder {
+	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_encoder(id.into());