diff --git a/.gitignore b/.gitignore
index 1f99e83539..ecdfe72781 100644
--- a/.gitignore
+++ b/.gitignore
@@ -92,6 +92,7 @@ lcov*.info
 /libruby*.*
 /miniprelude.c
 /miniruby
+/mjit_build_dir.c
 /newdate.rb
 /newline.c
 /newver.rb