diff --git a/Symfony.gitignore b/Symfony.gitignore
index 636b6f8e..c68377d1 100644
--- a/Symfony.gitignore
+++ b/Symfony.gitignore
@@ -30,5 +30,8 @@
 /app/phpunit.xml
 /phpunit.xml
 
+# Build data
+/build/
+
 # Composer PHAR
 /composer.phar