diff --git a/tests/test-revert-unknown.out b/tests/test-revert-unknown.out
--- a/tests/test-revert-unknown.out
+++ b/tests/test-revert-unknown.out
@@ -1,7 +1,7 @@
 %% Should show unknown
 ? unknown
 %% Should show unknown and b removed
-! b
+R b
 ? unknown
 %% Should show a and unknown
 a