diff --git a/lib/models/role.js b/lib/models/role.js
index 7d583043..e249f780 100644
--- a/lib/models/role.js
+++ b/lib/models/role.js
@@ -112,8 +112,6 @@ var Role = loopback.createModel('Role', RoleSchema, {
   }
 });
 
-Role.RoleMapping = RoleMapping;
-
 // Set up the connection to users/applications/roles once the model
 Role.once('dataSourceAttached', function () {
   var roleMappingModel = this.RoleMapping || loopback.getModelByType(RoleMapping);
@@ -338,7 +336,7 @@ Role.isInRole = function (role, context, callback) {
     return;
   }
 
-  var roleMappingModel = this.RoleMapping || RoleMapping;
+  var roleMappingModel = this.RoleMapping || loopback.getModelByType(RoleMapping);
   this.findOne({where: {name: role}}, function (err, result) {
     if (err) {
       callback && callback(err);