diff --git a/app/models/KeyableModel.rb b/app/models/KeyableModel.rb
new file mode 100644
index 000000000..846bde92b
--- /dev/null
+++ b/app/models/KeyableModel.rb
@@ -0,0 +1 @@
+KeyableModel = Struct.new(:model_name, :to_key, :param_key, keyword_init: true)
diff --git a/app/models/type_de_champ.rb b/app/models/type_de_champ.rb
index 6aa4b2fd3..281274a82 100644
--- a/app/models/type_de_champ.rb
+++ b/app/models/type_de_champ.rb
@@ -614,8 +614,10 @@ class TypeDeChamp < ApplicationRecord
   end
 
   def stable_self
-    OpenStruct.new(to_key: [stable_id],
-      model_name: OpenStruct.new(param_key: model_name.param_key))
+    KeyableModel.new(
+      to_key: [stable_id],
+      model_name: KeyableModel.new(param_key: model_name.param_key)
+    )
   end
 
   def refresh_after_update?