diff --git a/crates/red_knot_python_semantic/src/types/class.rs b/crates/red_knot_python_semantic/src/types/class.rs
index 801e45b4d529a..9416cbab67cd4 100644
--- a/crates/red_knot_python_semantic/src/types/class.rs
+++ b/crates/red_knot_python_semantic/src/types/class.rs
@@ -949,7 +949,6 @@ impl<'db> KnownClass {
     }
 
     fn display(self, db: &'db dyn Db) -> impl std::fmt::Display + 'db {
-        #[derive(Clone, Copy)]
         struct KnownClassDisplay<'db> {
             db: &'db dyn Db,
             class: KnownClass,