diff --git a/wCenterWindow/wCenterWindow.cpp b/wCenterWindow/wCenterWindow.cpp
index 6ce278a..795c84e 100644
--- a/wCenterWindow/wCenterWindow.cpp
+++ b/wCenterWindow/wCenterWindow.cpp
@@ -290,6 +290,14 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 	}
 	break;
 
+	case WM_QUERYENDSESSION:
+	{
+		diag_log(L"Recieved WM_QUERYENDSESSION message, lParam =", lParam);
+		CloseLogFile();
+		return TRUE;
+		break;
+	}
+
 	case WM_DESTROY:
 	{
 		PostQuitMessage(0);