diff --git a/double_field.module b/double_field.module
index 898749d..8407e5f 100644
--- a/double_field.module
+++ b/double_field.module
@@ -326,7 +326,9 @@ function double_field_field_presave($entity_type, $entity, $field, $instance, $l
  * Implements hook_field_create_instance().
  */
 function double_field_field_create_instance($instance) {
-  double_field_field_update_instance($instance, $instance);
+  if (module_exists('i18n_string')) {
+    double_field_i18n_strings_update($instance);
+  }
 }
 
 /**