diff --git a/lib/api/v3/work_packages/work_package_representer.rb b/lib/api/v3/work_packages/work_package_representer.rb
index a3056b16d2..6aab815a4c 100644
--- a/lib/api/v3/work_packages/work_package_representer.rb
+++ b/lib/api/v3/work_packages/work_package_representer.rb
@@ -218,7 +218,7 @@ module API
         property :lock_version
         property :subject, render_nil: true
         property :type, render_nil: true
-        property :description, exec_context: :decorator, render_nil: true
+        property :description, exec_context: :decorator, render_nil: true, writeable: false
         property :raw_description,
                  getter: -> (*) { description },
                  setter: -> (value, *) { description = value },