diff --git a/win_res.rc b/win_res.rc
index 36bdd7d9..0e799ab9 100644
--- a/win_res.rc
+++ b/win_res.rc
@@ -4,6 +4,8 @@
 
 #include "win_res.h"
 
+IDI_MAINICON ICON "putty.ico"
+
 IDD_ABOUTBOX DIALOG DISCARDABLE 140, 40, 136, 70
 STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
 CAPTION "About PuTTY"