diff --git a/.gitignore b/.gitignore
index 058f3eefb..bad3ea1d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@
 *.start
 
 # generated by build and tests
+/_build
 /infer/_build
 /infer/tests/codetoanalyze/java/*/codetoanalyze
 _build_infer