diff --git a/test/toAdditive.lean b/test/toAdditive.lean
index 85aec546bd8e0..ed344ce099c1b 100644
--- a/test/toAdditive.lean
+++ b/test/toAdditive.lean
@@ -221,11 +221,6 @@ attribute [to_additive add_some_def] some_def
 
 run_cmd do liftCoreM <| successIfFail (getConstInfo `Test.add_some_def.in_namespace)
 
--- [todo] currently this test breaks.
--- example : (AddUnits.mk_of_add_eq_zero 0 0 (by simp) : ℕ)
---         = (AddUnits.mk_of_add_eq_zero 0 0 (by simp) : ℕ) :=
--- by norm_cast
-
 section
 
 set_option linter.unusedVariables false