diff --git a/lib/Entity.js b/lib/Entity.js
index bfaa345..069e708 100644
--- a/lib/Entity.js
+++ b/lib/Entity.js
@@ -2,6 +2,7 @@
 
 const uuid = require('uuid');
 const PersistenceUtils = require("./PersistenceUtils");
+const typly = require("typly");
 
 module.exports = class Entity {
     constructor(config)
@@ -59,7 +60,7 @@ module.exports = class Entity {
                     {
                         obj[newKey] = this[key];
                     }
-                    else if (PersistenceUtils.isInstanceOf(property, Entity))
+                    else if (typly.isInstanceOf(property, Entity))
                     {
                         obj[newKey] = property;
                     }
diff --git a/lib/MetaModel.js b/lib/MetaModel.js
index 5f1bcce..6a0cec2 100644
--- a/lib/MetaModel.js
+++ b/lib/MetaModel.js
@@ -69,7 +69,7 @@ module.exports = class MetaModel {
         }
         if(this.entityClass)
         {
-            if (PersistenceUtils.isInstanceOf(entity, this.entityClass)  === false)
+            if (typly.isInstanceOf(entity, this.entityClass)  === false)
             {
                 throw new RangeError("row cannot be prepared, unexpected entity class: " + entity.constructor.name);
             }
diff --git a/lib/PersistenceUtils.js b/lib/PersistenceUtils.js
index d07b679..0b6e414 100644
--- a/lib/PersistenceUtils.js
+++ b/lib/PersistenceUtils.js
@@ -16,7 +16,7 @@ module.exports = class PersistenceUtils {
         typly.assertNotNull(value);
         if (typly.isObject(value))
         {
-            if (PersistenceUtils.isInstanceOf(value, TimeUuid) )
+            if (typly.isInstanceOf(value, TimeUuid) )
             {
                 return value;
             }
@@ -124,33 +124,4 @@ module.exports = class PersistenceUtils {
         });
         return obj;
     }
-
-    static isInstanceOf(_object, _class)
-    {
-        if (typeof _object !== "object" || _object == undefined || _object === null)
-        {
-            throw TypeError("Not valid input for isInstanceOf");
-        }
-        //let hasInstance = _object[Symbol.hasInstance];
-
-        let isImplementation = true;
-        let targetPrototype = _class.prototype;
-        if (_class.constructor)
-        {
-            targetPrototype = new _class();
-        }
-        let propNames = Object.getOwnPropertyNames(targetPrototype);
-        if(propNames.length !== Object.getOwnPropertyNames(_object).length)
-        {
-            return false;
-        }
-        propNames.forEach(function (propName, idx, array)
-        {
-            if (!_object.hasOwnProperty(propName))
-            {
-                return false;
-            }
-        });
-        return true;
-    }
 };
\ No newline at end of file