diff --git a/drivers/md/dm-cache-background-tracker.c b/drivers/md/dm-cache-background-tracker.c
index 1d0af0a21fc7e8253ebdba8e47e581e7b112ef3b..84814e819e4c35130ad6444feb88082c37c35768 100644
--- a/drivers/md/dm-cache-background-tracker.c
+++ b/drivers/md/dm-cache-background-tracker.c
@@ -166,7 +166,7 @@ static bool max_work_reached(struct background_tracker *b)
 		atomic_read(&b->pending_demotes) >= b->max_work;
 }
 
-struct bt_work *alloc_work(struct background_tracker *b)
+static struct bt_work *alloc_work(struct background_tracker *b)
 {
 	if (max_work_reached(b))
 		return NULL;