diff --git a/bundler/bin/parallel_rspec b/bundler/bin/parallel_rspec
index d8ccd5b4fc49..5c0e8adcc8b2 100755
--- a/bundler/bin/parallel_rspec
+++ b/bundler/bin/parallel_rspec
@@ -4,6 +4,8 @@
 require_relative "../spec/support/rubygems_ext"
 
 require_relative "../spec/support/switch_rubygems"
+
+require "ostruct" # Backfill missing require in turbo_tests. Remove when added upstream
 require "turbo_tests"
 
 if RUBY_PLATFORM.match?(/mingw|mswin/)