diff --git a/tests/lean/crash.lean b/tests/lean/crash.lean
index b65542a4d5..e8b4601729 100644
--- a/tests/lean/crash.lean
+++ b/tests/lean/crash.lean
@@ -3,7 +3,7 @@ import logic
 section
 hypothesis P : Prop.
 
-theorem crash
+definition crash
          := assume H : P,
             have H' : ¬ P,
             from H,