diff --git a/block/blk-merge.c b/block/blk-merge.c
index 2a06fd33039d..4e3483a16b75 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -726,7 +726,7 @@ static int ll_merge_requests_fn(struct request_queue *q, struct request *req,
  *     which can be mixed are set in each bio and mark @rq as mixed
  *     merged.
  */
-void blk_rq_set_mixed_merge(struct request *rq)
+static void blk_rq_set_mixed_merge(struct request *rq)
 {
 	blk_opf_t ff = rq->cmd_flags & REQ_FAILFAST_MASK;
 	struct bio *bio;
diff --git a/block/blk.h b/block/blk.h
index 5cac4e29ae17..d9f584984bc4 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -339,7 +339,6 @@ int ll_back_merge_fn(struct request *req, struct bio *bio,
 bool blk_attempt_req_merge(struct request_queue *q, struct request *rq,
 				struct request *next);
 unsigned int blk_recalc_rq_segments(struct request *rq);
-void blk_rq_set_mixed_merge(struct request *rq);
 bool blk_rq_merge_ok(struct request *rq, struct bio *bio);
 enum elv_merge blk_try_merge(struct request *rq, struct bio *bio);