diff --git a/app/models/manageiq/providers/base_manager/refresh_worker.rb b/app/models/manageiq/providers/base_manager/refresh_worker.rb
index 7bee2b923c7..962f45d4a4d 100644
--- a/app/models/manageiq/providers/base_manager/refresh_worker.rb
+++ b/app/models/manageiq/providers/base_manager/refresh_worker.rb
@@ -3,6 +3,8 @@ class ManageIQ::Providers::BaseManager::RefreshWorker < MiqQueueWorkerBase
 
   include PerEmsWorkerMixin
 
+  # Don't allow multiple refresh workers to run at once
+  self.include_stopping_workers_on_synchronize = true
   self.required_roles = "ems_inventory"
 
   def friendly_name