diff --git a/idmaterio.module b/idmaterio.module
index 4295e7b5..a474c545 100644
--- a/idmaterio.module
+++ b/idmaterio.module
@@ -59,7 +59,7 @@ function computed_field_field_identifiant_compute(&$entity_field, $entity_type,
 	}
 }
 
-function computed_field_field_identifiant_display($field, $entity_field_item, $entity_lang, $langcode) {
+function computed_field_field_identifiant_display($field, $entity_field_item, $entity_lang = "en", $langcode = "en") {
 	return $entity_field_item['value'];
 }
 
@@ -80,7 +80,7 @@ function computed_field_field_reference_materio_compute(&$entity_field, $entity_
 	
 }
 
-function computed_field_field_reference_materio_display($field, $entity_field_item, $entity_lang, $langcode) {
+function computed_field_field_reference_materio_display($field, $entity_field_item, $entity_lang = "en", $langcode = "en") {
 	return $entity_field_item['value'];
 }