diff --git a/app/workers/scheduler/email_domain_block_refresh_scheduler.rb b/app/workers/scheduler/email_domain_block_refresh_scheduler.rb
index c67be684385..e0ad89866b6 100644
--- a/app/workers/scheduler/email_domain_block_refresh_scheduler.rb
+++ b/app/workers/scheduler/email_domain_block_refresh_scheduler.rb
@@ -15,7 +15,8 @@ class Scheduler::EmailDomainBlockRefreshScheduler
           if ip?(email_domain_block.domain)
             [email_domain_block.domain]
           else
-            dns.getresources(email_domain_block.domain, Resolv::DNS::Resource::IN::A).to_a + dns.getresources(email_domain_block.domain, Resolv::DNS::Resource::IN::AAAA).to_a.map { |resource| resource.address.to_s }
+            resources = dns.getresources(email_domain_block.domain, Resolv::DNS::Resource::IN::A).to_a + dns.getresources(email_domain_block.domain, Resolv::DNS::Resource::IN::AAAA).to_a
+            resources.map { |resource| resource.address.to_s }
           end
         end