diff --git a/reactos/include/ndk/ifssupp.h b/reactos/include/ndk/ifssupp.h
index c3feeac2243..2ebc600b46e 100644
--- a/reactos/include/ndk/ifssupp.h
+++ b/reactos/include/ndk/ifssupp.h
@@ -28,6 +28,7 @@ typedef enum _TOKEN_TYPE
 } TOKEN_TYPE, *PTOKEN_TYPE;
 
 typedef PVOID PRTL_HEAP_PARAMETERS;
+typedef PVOID PFS_FILTER_CALLBACKS;
 typedef USHORT SECURITY_DESCRIPTOR_CONTROL, *PSECURITY_DESCRIPTOR_CONTROL;
 
 typedef struct _RTL_SPLAY_LINKS