diff --git a/src/addcontactpanel.h b/src/addcontactpanel.h
index 5b35afe..9a5fe75 100644
--- a/src/addcontactpanel.h
+++ b/src/addcontactpanel.h
@@ -41,7 +41,7 @@
 
 private:
   Ui::AddContactPanel *ui;
-  Ptr<EndorseCertificate> m_selfEndorseCertificate;
+  ndn::Ptr<EndorseCertificate> m_selfEndorseCertificate;
 };
 
 #endif // ADDCONTACTPANEL_H