diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index f9afb164b887d..12dae9348147e 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -318,7 +318,7 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list)
 	}
 }
 
-bool is_discard_enabled(struct cache_set *s)
+static bool is_discard_enabled(struct cache_set *s)
 {
 	struct cache *ca;
 	unsigned int i;