diff --git a/muxers/yamux/src/lib.rs b/muxers/yamux/src/lib.rs
index 213bee51027..b93de31c35b 100644
--- a/muxers/yamux/src/lib.rs
+++ b/muxers/yamux/src/lib.rs
@@ -317,7 +317,7 @@ impl Config {
             }
         };
 
-        f(&mut cfg012);
+        f(cfg012);
 
         self
     }