--- src/openzl/common/allocation.c	2025-10-06 11:47:11.000000000 +0800
+++ src/openzl/common/allocation.c	2026-02-04 04:50:01.000000000 +0800
@@ -134,6 +134,9 @@
 typedef struct {
     size_t index;
     size_t size;
+#ifndef __LP64__
+    uint64_t _pad;
+#endif
 } HeapMeta;
 
 DECLARE_VECTOR_POINTERS_TYPE(HeapMeta)