diff --git a/Ruby.gitignore b/Ruby.gitignore
index 560d1a6a..3e4cb76d 100644
--- a/Ruby.gitignore
+++ b/Ruby.gitignore
@@ -2,6 +2,7 @@
 *.rbc
 .bundle
 .config
+.rbx/
 coverage
 InstalledFiles
 lib/bundler/man