diff --git a/lib/authlogic/acts_as_authentic/login.rb b/lib/authlogic/acts_as_authentic/login.rb
index 7ea87a13..d70ca06a 100644
--- a/lib/authlogic/acts_as_authentic/login.rb
+++ b/lib/authlogic/acts_as_authentic/login.rb
@@ -94,7 +94,7 @@ def merge_validates_uniqueness_of_login_field_options(options = {})
         # manner that they handle that. If you are using the login field and set false for the :case_sensitive option in
         # validates_uniqueness_of_login_field_options this method will modify the query to look something like:
         #
-        #   where("#{quoted_table_name}.#{field} LIKE ?", login).first
+        #   where("LOWER(#{quoted_table_name}.#{login_field}) = ?", login.downcase).first
         #
         # If you don't specify this it calls the good old find_by_* method:
         #
@@ -118,8 +118,7 @@ def find_with_case(field, value, sensitivity = true)
             if sensitivity
               send("find_by_#{field}", value)
             else
-              like_word = ::ActiveRecord::Base.connection.adapter_name == "PostgreSQL" ? "ILIKE" : "LIKE"
-              where("#{quoted_table_name}.#{field} #{like_word} ?", value.mb_chars).first
+              where("LOWER(#{quoted_table_name}.#{field}) = ?", value.mb_chars.downcase).first
             end
           end
       end