diff --git a/.gitignore b/.gitignore
index da9baf144..ee978dc4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -212,6 +212,7 @@ TAGS
 /tests/conform/test-group-depth-sorting
 /tests/conform/test-conformance-result.xml
 /tests/conform/test-fixed-size
+/tests/conform/test-preferred-size
 /tests/micro-bench/test-text-perf
 /tests/micro-bench/test-text
 /tests/micro-bench/test-picking