diff --git a/lib/sidekiq/extensions/action_mailer.rb b/lib/sidekiq/extensions/action_mailer.rb
index 14a8e9ed..a03d7dc2 100644
--- a/lib/sidekiq/extensions/action_mailer.rb
+++ b/lib/sidekiq/extensions/action_mailer.rb
@@ -25,7 +25,7 @@ module Sidekiq
         Proxy.new(DelayedMailer, self)
       end
       def delay_for(interval)
-        Proxy.new(DelayedMailer, self, Time.now + interval)
+        Proxy.new(DelayedMailer, self, Time.now.to_f + interval.to_f)
       end
     end
 
diff --git a/lib/sidekiq/extensions/active_record.rb b/lib/sidekiq/extensions/active_record.rb
index efef2493..ee1859fa 100644
--- a/lib/sidekiq/extensions/active_record.rb
+++ b/lib/sidekiq/extensions/active_record.rb
@@ -22,7 +22,7 @@ module Sidekiq
         Proxy.new(DelayedModel, self)
       end
       def delay_for(interval)
-        Proxy.new(DelayedModel, self, Time.now + interval)
+        Proxy.new(DelayedModel, self, Time.now.to_f + interval.to_f)
       end
     end