diff --git a/lib/executor.js b/lib/executor.js
index ba55438..8a238dd 100644
--- a/lib/executor.js
+++ b/lib/executor.js
@@ -127,7 +127,7 @@ function setupDataSources(app, instructions) {
 }
 
 function setupModels(app, instructions) {
-  defineModels(instructions);
+  defineModels(app, instructions);
 
   instructions.models.forEach(function(data) {
     // Skip base models that are not exported to the app
@@ -137,20 +137,20 @@ function setupModels(app, instructions) {
   });
 }
 
-function defineModels(instructions) {
+function defineModels(app, instructions) {
   instructions.models.forEach(function(data) {
     var name = data.name;
     var model;
 
     if (!data.definition) {
-      model = loopback.getModel(name);
+      model = app.loopback.getModel(name);
       if (!model) {
         throw new Error('Cannot configure unknown model ' + name);
       }
       debug('Configuring existing model %s', name);
     } else {
       debug('Creating new model %s %j', name, data.definition);
-      model = loopback.createModel(data.definition);
+      model = app.loopback.createModel(data.definition);
       if (data.sourceFile) {
         debug('Loading customization script %s', data.sourceFile);
         var code = require(data.sourceFile);