diff --git a/reactos/include/ddk/iodef.h b/reactos/include/ddk/iodef.h
index bec861fb693..0d9b545e7c2 100644
--- a/reactos/include/ddk/iodef.h
+++ b/reactos/include/ddk/iodef.h
@@ -159,15 +159,27 @@ enum
 /*
  * PURPOSE: Bus types
  */
-enum
+typedef enum _INTERFACE_TYPE
 {
+   InterfaceTypeUndefined = -1,
    Internal,
    Isa,
+   Eisa,
    MicroChannel,
    TurboChannel,
    PCIBus,
-   MaximumInterfaceType,
-};
+   VMEBus,
+   NuBus,
+   PCMCIABus,
+   CBus,
+   MPIBus,
+   MPSABus,
+   ProcessorInternal,
+   InternalPowerBus,
+   PNPISABus,
+   MaximumInterfaceType
+} INTERFACE_TYPE, *PINTERFACE_TYPE;
+
 
 /*
  * FIXME: These are not in the correct order
diff --git a/reactos/include/ddk/iotypes.h b/reactos/include/ddk/iotypes.h
index d60145f32b3..0520df9a26a 100644
--- a/reactos/include/ddk/iotypes.h
+++ b/reactos/include/ddk/iotypes.h
@@ -1,4 +1,4 @@
-/* $Id: iotypes.h,v 1.12 2000/03/06 01:02:30 ea Exp $
+/* $Id: iotypes.h,v 1.13 2000/03/12 01:22:37 ekohl Exp $
  * 
  */
 
@@ -31,9 +31,6 @@ typedef enum _CREATE_FILE_TYPE
 } CREATE_FILE_TYPE;
 
 
-typedef ULONG INTERFACE_TYPE;
-typedef INTERFACE_TYPE* PINTERFACE_TYPE;
-
 /*
  * FIXME: Definition needed
  */