diff --git a/tests/lean/906.lean.expected.out b/tests/lean/906.lean.expected.out
index bee17bbe5f..10ea7227c2 100644
--- a/tests/lean/906.lean.expected.out
+++ b/tests/lean/906.lean.expected.out
@@ -1,2 +1,3 @@
 906.lean:7:14-7:19: warning: declaration uses 'sorry'
-906.lean:12:2-12:28: error: (deterministic) timeout at 'whnf', maximum number of heartbeats (50000) has been reached (use 'set_option maxHeartbeats <num>' to set the limit)
+906.lean:12:2-12:28: error: tactic 'simp' failed, nested error:
+(deterministic) timeout at 'whnf', maximum number of heartbeats (50000) has been reached (use 'set_option maxHeartbeats <num>' to set the limit)