diff --git a/tests/lean/run/cases_bug.lean b/tests/lean/run/cases_bug.lean
index 706df951a8..76f4f91c64 100644
--- a/tests/lean/run/cases_bug.lean
+++ b/tests/lean/run/cases_bug.lean
@@ -1,4 +1,4 @@
 import logic.cast
 
-theorem cast_heq : ∀ {A B : Type} (H : A = B) (a : A), cast H a == a
+theorem cast_heq₂ : ∀ {A B : Type} (H : A = B) (a : A), cast H a == a
 | A A (eq.refl A) a := heq_of_eq !cast_eq