diff --git a/actix-http/src/extensions.rs b/actix-http/src/extensions.rs
index a40bcec42..e1d9a9dc0 100644
--- a/actix-http/src/extensions.rs
+++ b/actix-http/src/extensions.rs
@@ -220,6 +220,6 @@ mod tests {
         assert_eq!(extensions.get(), Some(&MyType(10)));
 
         assert_eq!(extensions.get(), Some(&20u8));
-        assert_eq!(extensions.get_mut(), Some(&20u8));
+        assert_eq!(extensions.get_mut(), Some(&mut 20u8));
     }
 }