diff --git a/compiler/test_gen/src/gen_tags.rs b/compiler/test_gen/src/gen_tags.rs
index 3cfc8dd596..c178ea5c85 100644
--- a/compiler/test_gen/src/gen_tags.rs
+++ b/compiler/test_gen/src/gen_tags.rs
@@ -974,19 +974,3 @@ fn newtype_wrapper() {
         |x: &i64| *x
     );
 }
-
-#[test]
-fn open_tag_union_cannot_grow() {
-    assert_evals_to!(
-        indoc!(
-            r#"
-            f : [ A ]* -> [ A, B, C ]
-            f = \a -> a
-
-            f
-            "#
-        ),
-        4,
-        i64
-    )
-}