diff --git a/lib/devise/models/recoverable.rb b/lib/devise/models/recoverable.rb
index e5c5a2c8..94407e1e 100644
--- a/lib/devise/models/recoverable.rb
+++ b/lib/devise/models/recoverable.rb
@@ -83,7 +83,7 @@ module Devise
       #   reset_password_period_valid?   # will always return false
       #
       def reset_password_period_valid?
-        reset_password_sent_at && reset_password_sent_at.utc >= self.class.reset_password_within.ago
+        reset_password_sent_at && reset_password_sent_at.utc >= self.class.reset_password_within.ago.utc
       end
 
       protected