diff --git a/lib/tasks/clean_services.rake b/lib/tasks/clean_services.rake
index 95d2dfec5..585179818 100644
--- a/lib/tasks/clean_services.rake
+++ b/lib/tasks/clean_services.rake
@@ -14,7 +14,7 @@ namespace :service do
     progress = ProgressReport.new(admins.count)
 
     admins.each do |admin|
-      AdministrateurMailer.notify_service_without_siret(admin.email).deliver
+      AdministrateurMailer.notify_service_without_siret(admin.email).deliver_later
       progress.inc
     end
   end
diff --git a/spec/lib/tasks/clean_services_spec.rb b/spec/lib/tasks/clean_services_spec.rb
index 7046e6c10..452e658aa 100644
--- a/spec/lib/tasks/clean_services_spec.rb
+++ b/spec/lib/tasks/clean_services_spec.rb
@@ -36,7 +36,7 @@ describe 'service tasks' do
 
     it 'emails admins with published procedures with services without siret' do
       message = double("message")
-      allow(message).to receive(:deliver)
+      allow(message).to receive(:deliver_later)
       allow(AdministrateurMailer).to receive(:notify_service_without_siret).with(administrateur.email).and_return(message)
       allow(AdministrateurMailer).to receive(:notify_service_without_siret).with(administrateur_with_siret_service.email).and_return(message)