diff --git a/gui.cpp b/gui.cpp
index 78e7df6..80cb999 100644
--- a/gui.cpp
+++ b/gui.cpp
@@ -299,6 +299,7 @@ void MyFrame::OnQuit( wxCommandEvent &event )
 
 MyFrame::~MyFrame(void)
 {
+	m_timer->Stop();
 	close_port();
 }