diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 1f503e8e42d483a765b71b9b5910fce0ede0ea6f..379d678e3894ed324ebc0e8c8117fba4dc653779 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -160,7 +160,7 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
  */
 static inline u32 sb_zone_number(int shift, int mirror)
 {
-	u64 zone;
+	u64 zone = U64_MAX;
 
 	ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
 	switch (mirror) {