diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 503ab8b..5e82067 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1261,7 +1261,7 @@
 	}
 
 	sfp->mmap_called = 1;
-	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 	vma->vm_private_data = sfp;
 	vma->vm_ops = &sg_mmap_vm_ops;
 	return 0;