diff --git a/tests/lean/770.lean.expected.out b/tests/lean/770.lean.expected.out
index 7032639714..540ab2ff51 100644
--- a/tests/lean/770.lean.expected.out
+++ b/tests/lean/770.lean.expected.out
@@ -1 +1,2 @@
-file '770.lean' not found
+770.lean:1:25-3:40: error: invalid 'do' notation, expected type is not a monad application
+  Nat