diff --git a/reactos/w32api/include/ddk/winddk.h b/reactos/w32api/include/ddk/winddk.h
index e7836273797..2272a884f79 100644
--- a/reactos/w32api/include/ddk/winddk.h
+++ b/reactos/w32api/include/ddk/winddk.h
@@ -339,7 +339,6 @@ extern NTOSAPI POBJECT_TYPE ExDesktopObjectType;
 extern NTOSAPI POBJECT_TYPE ExEventObjectType;
 extern NTOSAPI POBJECT_TYPE ExSemaphoreObjectType;
 extern NTOSAPI POBJECT_TYPE ExWindowStationObjectType;
-extern NTOSAPI POBJECT_TYPE IoAdapterObjectType;
 extern NTOSAPI ULONG IoDeviceHandlerObjectSize;
 extern NTOSAPI POBJECT_TYPE IoDeviceHandlerObjectType;
 extern NTOSAPI POBJECT_TYPE IoDeviceObjectType;