diff --git a/src/auditor/.gitignore b/src/auditor/.gitignore
index 1f58b119b..fac12fb12 100644
--- a/src/auditor/.gitignore
+++ b/src/auditor/.gitignore
@@ -11,3 +11,4 @@ texput.aux
 test-audit-inc.json
 test-wire-audit-inc.json
 wirefees/
+bank.err