diff --git a/lib/datasource.js b/lib/datasource.js
index 7c8b4190..e1841968 100644
--- a/lib/datasource.js
+++ b/lib/datasource.js
@@ -364,7 +364,7 @@ function isModelClass(cls) {
   return cls.prototype instanceof ModelBaseClass;
 }
 
-DataSource.relationTypes = ['belongsTo', 'hasMany', 'hasAndBelongsToMany'];
+DataSource.relationTypes = ['belongsTo', 'hasMany', 'hasAndBelongsToMany', 'hasOne'];
 
 function isModelDataSourceAttached(model) {
   return model && (!model.settings.unresolved) && (model.dataSource instanceof DataSource);