diff --git a/crates/ty_python_semantic/src/types/typed_dict.rs b/crates/ty_python_semantic/src/types/typed_dict.rs
index e07fbb999d..dee49a3afe 100644
--- a/crates/ty_python_semantic/src/types/typed_dict.rs
+++ b/crates/ty_python_semantic/src/types/typed_dict.rs
@@ -71,7 +71,7 @@ impl<'db> TypedDictType<'db> {
     }
 
     pub(crate) fn items(self, db: &'db dyn Db) -> &'db TypedDictSchema<'db> {
-        #[salsa::tracked(returns(ref))]
+        #[salsa::tracked(returns(ref), heap_size=ruff_memory_usage::heap_size)]
         fn class_based_items<'db>(db: &'db dyn Db, class: ClassType<'db>) -> TypedDictSchema<'db> {
             let (class_literal, specialization) = class.class_literal(db);
             class_literal