diff --git a/fs/bcachefs/btree_key_cache.c b/fs/bcachefs/btree_key_cache.c
index 505e7c365ab7..a74ee6d8a7cf 100644
--- a/fs/bcachefs/btree_key_cache.c
+++ b/fs/bcachefs/btree_key_cache.c
@@ -1053,7 +1053,7 @@ int bch2_fs_btree_key_cache_init(struct btree_key_cache *bc)
 
 void bch2_btree_key_cache_to_text(struct printbuf *out, struct btree_key_cache *c)
 {
-	prt_printf(out, "nr_freed:\t%zu",	atomic_long_read(&c->nr_freed));
+	prt_printf(out, "nr_freed:\t%lu",	atomic_long_read(&c->nr_freed));
 	prt_newline(out);
 	prt_printf(out, "nr_keys:\t%lu",	atomic_long_read(&c->nr_keys));
 	prt_newline(out);