diff --git a/stripe.gemspec b/stripe.gemspec
index 874c52484..f79353146 100644
--- a/stripe.gemspec
+++ b/stripe.gemspec
@@ -36,6 +36,7 @@ Gem::Specification.new do |s|
     /\Abin/,
     /\Asorbet/,
     /\Atest/
+    /\Arbi/,
   )
   s.files = `git ls-files`.split("\n").grep_v(ignored)
   s.bindir = "exe"