diff --git a/tests/dns/testdata/master/.gitignore b/tests/dns/testdata/master/.gitignore
index 384d54f7a2..967ed19cbe 100644
--- a/tests/dns/testdata/master/.gitignore
+++ b/tests/dns/testdata/master/.gitignore
@@ -1,3 +1,4 @@
 master12.data
 master13.data
 master14.data
+master18.data