diff --git a/compiler/builtins/src/unique.rs b/compiler/builtins/src/unique.rs
index c6b269c7ec..c66c7e157d 100644
--- a/compiler/builtins/src/unique.rs
+++ b/compiler/builtins/src/unique.rs
@@ -675,12 +675,12 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
     });
 
     // contains : Attr * (List a)
-    //          , Attr Shared a
+    //          , Attr * a
     //          -> Attr * Bool
     add_type(Symbol::LIST_CONTAINS, {
         let_tvars! { a, star1, star2 };
 
-        unique_function(vec![list_type(star1, a), shared(flex(a))], bool_type(star2))
+        unique_function(vec![list_type(star1, a), flex(a)], bool_type(star2))
     });
 
     // join : Attr * (List (Attr * (List a)))