diff --git a/contrib/python3-whitelist b/contrib/python3-whitelist
--- a/contrib/python3-whitelist
+++ b/contrib/python3-whitelist
@@ -295,6 +295,7 @@
 test-histedit-edit.t
 test-histedit-fold-non-commute.t
 test-histedit-fold.t
+test-histedit-merge-tools.t
 test-histedit-no-backup.t
 test-histedit-no-change.t
 test-histedit-non-commute-abort.t