diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index a9b13f2cc420..58433581dc56 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -274,6 +274,7 @@ bool drbd_al_begin_io_fastpath(struct drbd_conf *mdev, struct drbd_interval *i)
 	return _al_get(mdev, first, true);
 }
 
+static
 bool drbd_al_begin_io_prepare(struct drbd_conf *mdev, struct drbd_interval *i)
 {
 	/* for bios crossing activity log extent boundaries,