diff --git a/script/minitest_runner.rb b/script/minitest_runner.rb
index <HASH>..<HASH> 100755
--- a/script/minitest_runner.rb
+++ b/script/minitest_runner.rb
@@ -74,4 +74,4 @@ class MinitestRunner
   end
 end
 
-MinitestRunner.new.run if $PROGRAM_NAME == __FILE__
+exit(MinitestRunner.new.run) if $PROGRAM_NAME == __FILE__
Return proper exit status from test runner

Otherwise bisecting can't work.