diff --git a/spec/parsing/large_number_spec.rb b/spec/parsing/large_number_spec.rb
index 36e24e68..d27b664b 100644
--- a/spec/parsing/large_number_spec.rb
+++ b/spec/parsing/large_number_spec.rb
@@ -39,7 +39,7 @@ def capture(cmd, stdin_data)
     end
 
     it 'runs successfully' do
-      out, err, status = capture('ruby', script)
+      out, err, status = capture('bundle exec ruby', script)
       expect([err, status.exitstatus]).to eq(['', 0])
     end
   end