diff --git a/lib/rails_admin/config/actions/new.rb b/lib/rails_admin/config/actions/new.rb
index f5e927f6be..25b92554bc 100644
--- a/lib/rails_admin/config/actions/new.rb
+++ b/lib/rails_admin/config/actions/new.rb
@@ -20,7 +20,7 @@ class New < RailsAdmin::Config::Actions::Base
               @authorization_adapter && @authorization_adapter.attributes_for(:new, @abstract_model).each do |name, value|
                 @object.send("#{name}=", value)
               end
-              if object_params = params[@abstract_model.to_param]
+              if object_params = params[@abstract_model.param_key]
                 sanitize_params_for!(request.xhr? ? :modal : :create)
                 @object.set_attributes(@object.attributes.merge(object_params.to_h))
               end
diff --git a/spec/integration/basic/new/rails_admin_namespaced_model_new_spec.rb b/spec/integration/basic/new/rails_admin_namespaced_model_new_spec.rb
index 5f71e51c87..a09b4f3a2a 100644
--- a/spec/integration/basic/new/rails_admin_namespaced_model_new_spec.rb
+++ b/spec/integration/basic/new/rails_admin_namespaced_model_new_spec.rb
@@ -16,15 +16,23 @@
   end
 
   describe 'GET /admin/cms_basic_page/new' do
-    before do
+    it 'has correct input field names' do
       visit new_path(model_name: 'cms~basic_page')
-    end
 
-    it 'has correct input field names' do
       is_expected.to have_selector('label[for=cms_basic_page_title]')
       is_expected.to have_selector("input#cms_basic_page_title[name='cms_basic_page[title]']")
       is_expected.to have_selector('label[for=cms_basic_page_content]')
       is_expected.to have_selector("textarea#cms_basic_page_content[name='cms_basic_page[content]']")
     end
+
+    it 'has default values' do
+      content = '4123lkj1sdlfjasdfjsdkfjsdfk'
+
+      visit new_path(model_name: 'cms~basic_page', cms_basic_page: {content: content})
+
+      within('#cms_basic_page_content_field') do
+        is_expected.to have_content(content)
+      end
+    end
   end
 end