diff --git a/reactos/include/psdk/shlguid.h b/reactos/include/psdk/shlguid.h
index 213a860a939..a68f631a971 100644
--- a/reactos/include/psdk/shlguid.h
+++ b/reactos/include/psdk/shlguid.h
@@ -58,6 +58,7 @@ DEFINE_GUID(IID_IProgressDialog, 0xEBBC7C04,0x315E,0x11D2,0xB6,0x2F,0x00,0x60,0x
 
 
 /* avoid duplicate definitions with shobjidl.h (FIXME) */
+/* DEFINE_GUID(IID_IDockingWindow,     0x012dd920L, 0x7B26, 0x11D0, 0x8C, 0xA9, 0x00, 0xA0, 0xC9, 0x2D, 0xBF, 0xE8); */
 /* DEFINE_OLEGUID(IID_IShellPropSheetExt,  0x000214E9L, 0, 0); */
 /* DEFINE_OLEGUID(IID_IExtractIconA,       0x000214EBL, 0, 0); */
 /* DEFINE_OLEGUID(IID_IExtractIconW,       0x000214FAL, 0, 0); */
@@ -100,7 +101,6 @@ DEFINE_GUID(SID_SCommDlgBrowser,  0x80f30233, 0xb7df, 0x11d2, 0xa3, 0x3b, 0x00,
 #define IID_IShellExecuteHook WINELIB_NAME_AW(IID_IShellExecuteHook)
 #define IID_INewShortcutHook  WINELIB_NAME_AW(IID_INewShortcutHook)
 
-DEFINE_GUID(IID_IDockingWindow,     0x012dd920L, 0x7B26, 0x11D0, 0x8C, 0xA9, 0x00, 0xA0, 0xC9, 0x2D, 0xBF, 0xE8);
 DEFINE_GUID(IID_IDockingWindowSite, 0x2A342FC2L, 0x7B26, 0x11D0, 0x8C, 0xA9, 0x00, 0xA0, 0xC9, 0x2D, 0xBF, 0xE8);
 DEFINE_GUID(IID_IInputObject,       0x068284FAA, 0x6A48, 0x11D0, 0x8C, 0x78, 0x00, 0xC0, 0x4F, 0xD9, 0x18, 0xB4);
 DEFINE_GUID(IID_IInputObjectSite,   0x0F1DB8392, 0x7331, 0x11D0, 0x8C, 0x99, 0x00, 0xA0, 0xC9, 0x2D, 0xBF, 0xE8);