diff --git a/fs/bcachefs/bkey_methods.c b/fs/bcachefs/bkey_methods.c
index db336a43fc083a79615e81ce9da37ff4877005f9..a275a9e8e341aa0669073625d6b39d376139739a 100644
--- a/fs/bcachefs/bkey_methods.c
+++ b/fs/bcachefs/bkey_methods.c
@@ -171,8 +171,8 @@ int __bch2_bkey_invalid(struct bch_fs *c, struct bkey_s_c k,
 	if (type >= BKEY_TYPE_NR)
 		return 0;
 
-	bkey_fsck_err_on((type == BKEY_TYPE_btree ||
-			  (flags & BKEY_INVALID_COMMIT)) &&
+	bkey_fsck_err_on(k.k->type < KEY_TYPE_MAX &&
+			 (type == BKEY_TYPE_btree || (flags & BKEY_INVALID_COMMIT)) &&
 			 !(bch2_key_types_allowed[type] & BIT_ULL(k.k->type)), c, err,
 			 bkey_invalid_type_for_btree,
 			 "invalid key type for btree %s (%s)",