diff --git a/lib/datasource.js b/lib/datasource.js
index 13f8c171..e8bfaf54 100644
--- a/lib/datasource.js
+++ b/lib/datasource.js
@@ -1256,7 +1256,8 @@ DataSource.prototype.defineForeignKey = function defineForeignKey(className, key
     if (this.connector.defineForeignKey) {
         var cb = function (err, keyType) {
             if (err) throw err;
-            this.definitions[className].defineProperty(key, {type: keyType});
+            // Add the foreign key property to the data source _models
+            this.defineProperty(className, key, {type: keyType || Number});
         }.bind(this);
         switch (this.connector.defineForeignKey.length) {
             case 4:
@@ -1268,10 +1269,10 @@ DataSource.prototype.defineForeignKey = function defineForeignKey(className, key
             break;
         }
     } else {
-        this.definitions[className].defineProperty(key, {type: Number});
+        // Add the foreign key property to the data source _models
+        this.defineProperty(className, key, {type: Number});
     }
-    
-    this.models[className].registerProperty(key);
+
 };
 
 /**