diff --git a/reactos/include/ddk/punknown.h b/reactos/include/ddk/punknown.h
index 748914701ec..bac87bd652c 100644
--- a/reactos/include/ddk/punknown.h
+++ b/reactos/include/ddk/punknown.h
@@ -33,7 +33,7 @@ extern "C" {
 #define __IUnknown_INTERFACE_DEFINED__
 DEFINE_GUID(
     IID_IUnknown,
-    0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x46);
+    0x00000000, 0x0000, 0x0000, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46);
 
 #undef INTERFACE
 #define INTERFACE IUnknown