diff --git a/app/models/dossier.rb b/app/models/dossier.rb
index b63c1e392..a1dd384e1 100644
--- a/app/models/dossier.rb
+++ b/app/models/dossier.rb
@@ -167,11 +167,11 @@ class Dossier < ActiveRecord::Base
 
   def export_entreprise_data
     if entreprise.present?
-      etablissement_attr = EtablissementCsvSerializer.new(self.etablissement).attributes.map { |k, v| ["etablissement.#{k}".parameterize.underscore.to_sym, v] }.to_h
-      entreprise_attr = EntrepriseSerializer.new(self.entreprise).attributes.map { |k, v| ["entreprise.#{k}".parameterize.underscore.to_sym, v] }.to_h
+      etablissement_attr = EtablissementCsvSerializer.new(self.etablissement).attributes.transform_keys { |k| "etablissement.#{k}".parameterize.underscore.to_sym }
+      entreprise_attr = EntrepriseSerializer.new(self.entreprise).attributes.transform_keys { |k| "entreprise.#{k}".parameterize.underscore.to_sym }
     else
-      etablissement_attr = EtablissementSerializer.new(Etablissement.new).attributes.map { |k, v| ["etablissement.#{k}".parameterize.underscore.to_sym, v] }.to_h
-      entreprise_attr = EntrepriseSerializer.new(Entreprise.new).attributes.map { |k, v| ["entreprise.#{k}".parameterize.underscore.to_sym, v] }.to_h
+      etablissement_attr = EtablissementSerializer.new(Etablissement.new).attributes.transform_keys { |k| "etablissement.#{k}".parameterize.underscore.to_sym }
+      entreprise_attr = EntrepriseSerializer.new(Entreprise.new).attributes.transform_keys { |k| "entreprise.#{k}".parameterize.underscore.to_sym }
     end
     convert_specific_hash_values_to_string(etablissement_attr.merge(entreprise_attr))
   end