diff --git a/src/protocol/frame/coding.rs b/src/protocol/frame/coding.rs
index 5fde5fb..13d9045 100644
--- a/src/protocol/frame/coding.rs
+++ b/src/protocol/frame/coding.rs
@@ -183,8 +183,8 @@ pub enum CloseCode {
 
 impl CloseCode {
     /// Check if this CloseCode is allowed.
-    pub fn is_allowed(&self) -> bool {
-        match *self {
+    pub fn is_allowed(self) -> bool {
+        match self {
             Bad(_)      => false,
             Reserved(_) => false,
             Status      => false,