diff --git a/reactos/sdk/include/ddk/fltkernel.h b/reactos/sdk/include/ddk/fltkernel.h
index ece1f4f9a86..5e04d5ceae0 100644
--- a/reactos/sdk/include/ddk/fltkernel.h
+++ b/reactos/sdk/include/ddk/fltkernel.h
@@ -911,7 +911,7 @@ typedef VOID
     _Inout_ PFLT_CALLBACK_DATA_QUEUE Cbdq,
     _Inout_ PFLT_CALLBACK_DATA Cbd);
 
-typedef enum _FLT_CALLBACK_DATA_QUEUE_FLAGS FLT_CALLBACK_DATA_QUEUE_FLAGS;
+typedef ULONG FLT_CALLBACK_DATA_QUEUE_FLAGS;
 
 typedef struct _FLT_CALLBACK_DATA_QUEUE {
   IO_CSQ Csq;