diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index 2ee0b876723a..c5d0f3e056cc 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -74,13 +74,13 @@ enum {
 };
 
 struct btrfs_free_space_ctl {
-	spinlock_t tree_lock;
 	struct rb_root free_space_offset;
 	struct rb_root_cached free_space_bytes;
-	u64 free_space;
+	spinlock_t tree_lock;
 	int extents_thresh;
 	int free_extents;
 	int total_bitmaps;
+	u64 free_space;
 	s32 discardable_extents[BTRFS_STAT_NR_ENTRIES];
 	s64 discardable_bytes[BTRFS_STAT_NR_ENTRIES];
 	const struct btrfs_free_space_op *op;