diff --git a/sane/DlgPage.cpp b/sane/DlgPage.cpp
index 2498f48..b8f2912 100644
--- a/sane/DlgPage.cpp
+++ b/sane/DlgPage.cpp
@@ -32,6 +32,7 @@ dlg_base::~dlg_base()
 {
 	if (IsWindow(hwnd_))
 	{
+		SetPropW(hwnd_, dlg_base::prop_name.c_str(), NULL);
 		//if (GetCurrentThreadId() == GetWindowThreadProcessId(hwnd_, NULL))
 			DestroyWindow(hwnd_);
 	}