diff --git a/.gitignore b/.gitignore
index f31e233bb7..5691e22d00 100644
--- a/.gitignore
+++ b/.gitignore
@@ -80,6 +80,7 @@ src/testdir/dostmp/*
 src/testdir/messages
 src/testdir/viminfo
 src/testdir/opt_test.vim
+runtime/indent/testdir/*.out
 src/memfile_test
 src/json_test
 src/message_test