diff --git a/actionpack/lib/action_controller/session/abstract_store.rb b/actionpack/lib/action_controller/session/abstract_store.rb
index 51acab2..2681db6 100644
--- a/actionpack/lib/action_controller/session/abstract_store.rb
+++ b/actionpack/lib/action_controller/session/abstract_store.rb
@@ -206,11 +206,8 @@ module ActionController
             cookie << "; HttpOnly" if options[:httponly]
 
             headers = response[1]
-            unless headers[SET_COOKIE].blank?
-              headers[SET_COOKIE] << "\n#{cookie}"
-            else
-              headers[SET_COOKIE] = cookie
-            end
+            headers[SET_COOKIE] = [] if headers[SET_COOKIE].blank?
+            headers[SET_COOKIE] << cookie
           end
         end
 
diff --git a/actionpack/test/activerecord/active_record_store_test.rb b/actionpack/test/activerecord/active_record_store_test.rb
index 6f2fe32..98678d7 100644
--- a/actionpack/test/activerecord/active_record_store_test.rb
+++ b/actionpack/test/activerecord/active_record_store_test.rb
@@ -31,7 +31,13 @@ class ActiveRecordStoreTest < ActionController::IntegrationTest
       session[:foo] = "baz"
       head :ok
     end
-
+    
+    def set_session_value_and_cookie
+      cookies["foo"] = "bar"
+      session[:foo] = "bar"
+      render :nothing => true
+    end
+    
     def rescue_action(e) raise end
   end
 
@@ -194,6 +200,15 @@ class ActiveRecordStoreTest < ActionController::IntegrationTest
       assert_equal session_id, cookies['_session_id']
     end
   end
+  
+  def test_setting_session_value_and_cookie
+    with_test_route_set do
+      get '/set_session_value_and_cookie'
+      assert_response :success
+      assert !cookies["\n_session_id"]
+      assert_equal({"_session_id" => request.session_options[:id], "foo" => "bar"}, cookies)
+    end
+  end
 
   private
     def with_test_route_set