diff --git a/.bcachefs_revision b/.bcachefs_revision
index 192f42ea..02a83950 100644
--- a/.bcachefs_revision
+++ b/.bcachefs_revision
@@ -1 +1 @@
-504729f99c4e1655be1da3e8c62d20b790483eba
+22ccceee1555cd9a66f0b444634a7c0099a73d77
diff --git a/libbcachefs/alloc_background.c b/libbcachefs/alloc_background.c
index aef796b5..8ce2027d 100644
--- a/libbcachefs/alloc_background.c
+++ b/libbcachefs/alloc_background.c
@@ -479,7 +479,7 @@ __bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
 {
 	struct bkey_i_alloc_v4 *ret;
 
-	ret = bch2_trans_kmalloc(trans, sizeof(struct bkey_i_alloc_v4));
+	ret = bch2_trans_kmalloc(trans, max(bkey_bytes(k.k), sizeof(struct bkey_i_alloc_v4)));
 	if (IS_ERR(ret))
 		return ret;