diff --git a/app/models/case_study.rb b/app/models/case_study.rb
index 0071e6f2e0d..f8ff8c93348 100644
--- a/app/models/case_study.rb
+++ b/app/models/case_study.rb
@@ -1,6 +1,7 @@
 class CaseStudy < Edition
   include Edition::Searchable
 
+  include ::Attachable
   include Edition::Images
   include Edition::FactCheckable
   include Edition::CustomLeadImage
diff --git a/test/unit/app/helpers/admin/tabbed_nav_helper_test.rb b/test/unit/app/helpers/admin/tabbed_nav_helper_test.rb
index dd8b21dacea..2543787d16a 100644
--- a/test/unit/app/helpers/admin/tabbed_nav_helper_test.rb
+++ b/test/unit/app/helpers/admin/tabbed_nav_helper_test.rb
@@ -160,7 +160,7 @@ def current_user
   end
 
   test "#secondary_navigation_tabs_items for persisted editions which do not allow attachments" do
-    %i[case_study fatality_notice speech].each do |type|
+    %i[fatality_notice speech].each do |type|
       edition = build_stubbed(type)
 
       expected_output = [
diff --git a/test/unit/app/models/case_study_test.rb b/test/unit/app/models/case_study_test.rb
index 4a1e2cfa5b1..32a6749d855 100644
--- a/test/unit/app/models/case_study_test.rb
+++ b/test/unit/app/models/case_study_test.rb
@@ -4,6 +4,8 @@ class CaseStudyTest < ActiveSupport::TestCase
   include ActionDispatch::TestProcess
 
   should_allow_image_attachments
+  should_be_attachable
+  should_allow_inline_attachments
   should_have_custom_lead_image
   should_protect_against_xss_and_content_attacks_on :case_study, :body