diff --git a/include/shlguid.h b/include/shlguid.h
index 23cce28..eaeb8d8 100644
--- a/include/shlguid.h
+++ b/include/shlguid.h
@@ -86,6 +86,8 @@ DEFINE_GUID(SID_STopLevelBrowser, 0x4C96BE40, 0x915C, 0x11CF, 0x99, 0xD3, 0x00,
 DEFINE_GUID(SID_STopWindow,       0x49e1b500, 0x4636, 0x11d3, 0x97, 0xf7, 0x00, 0xc0, 0x4f, 0x45, 0xd0, 0xb3);
 DEFINE_GUID(SID_SCommDlgBrowser,  0x80f30233, 0xb7df, 0x11d2, 0xa3, 0x3b, 0x00, 0x60, 0x97, 0xdf, 0x5b, 0xd4);
 
+DEFINE_GUID(CLSID_TaskbarList, 0x56fdf344, 0xfd6d, 0x11d0, 0x95, 0x8a, 0x00, 0x60, 0x97, 0xc9, 0xa0, 0x90);
+
 #define SID_LinkSite          IID_IShellLinkW
 #define SID_SShellBrowser     IID_IShellBrowser
 #define SID_SShellDesktop     CLSID_ShellDesktop