diff --git a/lib/procon_bypass_man/bypass/bypass_command.rb b/lib/procon_bypass_man/bypass/bypass_command.rb
index b2ebb6527..4b41b9081 100644
--- a/lib/procon_bypass_man/bypass/bypass_command.rb
+++ b/lib/procon_bypass_man/bypass/bypass_command.rb
@@ -94,7 +94,7 @@ def execute
       ProconBypassMan.logger.debug "BlueGreenProcess.terminate_workers_immediatelyを実行します"
       BlueGreenProcess.terminate_workers_immediately
       ProconBypassMan.logger.debug "BlueGreenProcess.terminate_workers_immediatelyを実行しました"
-      [t1, t2].each(&:join)
+      [t1, t2].each(&:kill)
       ProconBypassMan.logger.debug "[t1, t2].each(&:join)を実行しました"
       @gadget&.close
       @procon&.close