diff --git a/volumes.c b/volumes.c
index edad367b..677d085d 100644
--- a/volumes.c
+++ b/volumes.c
@@ -826,7 +826,7 @@ error:
 	return ret;
 }
 
-#define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info)	\
+#define BTRFS_MAX_DEVS(info) ((BTRFS_LEAF_DATA_SIZE(info)	\
 			- sizeof(struct btrfs_item)		\
 			- sizeof(struct btrfs_chunk))		\
 			/ sizeof(struct btrfs_stripe) + 1)
@@ -882,12 +882,12 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 			calc_size = SZ_1G;
 			max_chunk_size = 10 * calc_size;
 			min_stripe_size = SZ_64M;
-			max_stripes = BTRFS_MAX_DEVS(chunk_root);
+			max_stripes = BTRFS_MAX_DEVS(info);
 		} else if (type & BTRFS_BLOCK_GROUP_METADATA) {
 			calc_size = SZ_1G;
 			max_chunk_size = 4 * calc_size;
 			min_stripe_size = SZ_32M;
-			max_stripes = BTRFS_MAX_DEVS(chunk_root);
+			max_stripes = BTRFS_MAX_DEVS(info);
 		}
 	}
 	if (type & BTRFS_BLOCK_GROUP_RAID1) {