diff --git a/reactos/include/ddk/winddi.h b/reactos/include/ddk/winddi.h
index deb43990caf..05ea9db6d87 100644
--- a/reactos/include/ddk/winddi.h
+++ b/reactos/include/ddk/winddi.h
@@ -34,6 +34,8 @@
 typedef DWORD PTRDIFF;
 #endif
 
+typedef struct _ENG_EVENT *PEVENT;
+
 #define DM_SPECVERSION 0x0320
 
 #define DDI_DRIVER_VERSION_NT4 0x20000