diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f9711a82fc541143ddc88301e126963cd6987ae0..f95e55083bdb5fcd3fe8ce233ce08fef9bb1febd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3521,7 +3521,7 @@ static int reserve_metadata_bytes(struct btrfs_root *root,
 			avail >>= 1;
 		 spin_unlock(&root->fs_info->free_chunk_lock);
 
-		if (used + orig_bytes < space_info->total_bytes + avail) {
+		if (used + num_bytes < space_info->total_bytes + avail) {
 			space_info->bytes_may_use += orig_bytes;
 			ret = 0;
 		}