diff --git a/api/spec/mailer/mno_enterprise/system_notification_mailer_spec.rb b/api/spec/mailer/mno_enterprise/system_notification_mailer_spec.rb
index 12110d7e2..dbb0a2310 100644
--- a/api/spec/mailer/mno_enterprise/system_notification_mailer_spec.rb
+++ b/api/spec/mailer/mno_enterprise/system_notification_mailer_spec.rb
@@ -181,9 +181,11 @@ def invite_vars(orga_invite)
 
     describe 'send_invoice' do
       before do
+        Timecop.freeze
         stub_api_v2(:get, "/users/#{user.id}", user, [], {fields: {users: 'email,name'}})
         stub_api_v2(:get, "/invoices/#{invoice.id}", invoice)
       end
+      after { Timecop.return }
       let(:invoice) { build(:invoice) }
       let(:rendered_invoice) { MnoEnterprise::InvoicePdf.new(invoice).render }
       it 'sends the correct email' do