diff --git a/reactos/include/ddk/portcls.h b/reactos/include/ddk/portcls.h
index 3bd7bf95339..69c786942c7 100644
--- a/reactos/include/ddk/portcls.h
+++ b/reactos/include/ddk/portcls.h
@@ -791,6 +791,9 @@ typedef IInterruptSync *PINTERRUPTSYNC;
     IRegistryKey Interface
 */
 
+#undef INTERFACE
+#define INTERFACE IRegistryKey
+
 enum
 {
     GeneralRegistryKey,