diff --git a/compiler/builtins/src/unique.rs b/compiler/builtins/src/unique.rs
index 3fcdfaf05f..f66f5094d8 100644
--- a/compiler/builtins/src/unique.rs
+++ b/compiler/builtins/src/unique.rs
@@ -772,42 +772,15 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
     //     , Attr Shared (a -> b)
     //    -> Attr * (List b)
     add_type(Symbol::LIST_MAP, {
-        let_tvars! { star1, star2, star3, a, b };
+        let_tvars! { a, b, star1, star2 };
+
         unique_function(
             vec![
-                SolvedType::Apply(
-                    Symbol::ATTR_ATTR,
-                    vec![
-                        flex(star1),
-                        SolvedType::Apply(Symbol::LIST_LIST, vec![flex(a)]),
-                    ],
-                ),
-                SolvedType::Apply(
-                    Symbol::ATTR_ATTR,
-                    vec![
-                        flex(star2),
-                        SolvedType::Func(vec![flex(a)], Box::new(flex(b))),
-                    ],
-                ),
+                list_type(star1, a),
+                shared(SolvedType::Func(vec![flex(a)], Box::new(flex(b)))),
             ],
-            SolvedType::Apply(
-                Symbol::ATTR_ATTR,
-                vec![
-                    flex(star3),
-                    SolvedType::Apply(Symbol::LIST_LIST, vec![flex(b)]),
-                ],
-            ),
+            list_type(star2, b),
         )
-
-        // let_tvars! { a, b, star1, star2 };
-        //
-        // unique_function(
-        //     vec![
-        //         list_type(star1, a),
-        //         shared(SolvedType::Func(vec![flex(a)], Box::new(flex(b)))),
-        //     ],
-        //     list_type(star2, b),
-        // )
     });
 
     // foldr : Attr (* | u) (List (Attr u a))