diff --git a/reactos/drivers/filesystems/mup/mup.c b/reactos/drivers/filesystems/mup/mup.c
index 18cdf705074..507b9efa09c 100644
--- a/reactos/drivers/filesystems/mup/mup.c
+++ b/reactos/drivers/filesystems/mup/mup.c
@@ -72,7 +72,7 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
     }
 
   /* Initialize driver data */
-  DeviceObject->Flags = DO_DIRECT_IO;
+  DeviceObject->Flags |= DO_DIRECT_IO;
 //  DriverObject->MajorFunction[IRP_MJ_CLOSE] = NtfsClose;
   DriverObject->MajorFunction[IRP_MJ_CREATE] = MupCreate;
   DriverObject->MajorFunction[IRP_MJ_CREATE_NAMED_PIPE] = MupCreate;
diff --git a/reactos/drivers/filesystems/mup/mup.h b/reactos/drivers/filesystems/mup/mup.h
index 08f790d78e8..af69070321a 100644
--- a/reactos/drivers/filesystems/mup/mup.h
+++ b/reactos/drivers/filesystems/mup/mup.h
@@ -18,7 +18,7 @@ typedef struct
 
 
 /* create.c */
-
+DRIVER_DISPATCH MupCreate;
 NTSTATUS STDCALL
 MupCreate(PDEVICE_OBJECT DeviceObject,
 	  PIRP Irp);
diff --git a/reactos/drivers/filesystems/npfs/npfs.c b/reactos/drivers/filesystems/npfs/npfs.c
index 5c24cfe5c1b..042979ecde2 100644
--- a/reactos/drivers/filesystems/npfs/npfs.c
+++ b/reactos/drivers/filesystems/npfs/npfs.c
@@ -69,7 +69,7 @@ DriverEntry(PDRIVER_OBJECT DriverObject,
 	}
 
 	/* initialize the device object */
-	DeviceObject->Flags = DO_DIRECT_IO;
+	DeviceObject->Flags |= DO_DIRECT_IO;
 
 	/* initialize the device extension */
 	DeviceExtension = DeviceObject->DeviceExtension;