diff --git a/src/core/memp.c b/src/core/memp.c
index ad8e8fd6..2e3db28e 100644
--- a/src/core/memp.c
+++ b/src/core/memp.c
@@ -205,7 +205,7 @@ memp_overflow_check_all(void)
   SYS_ARCH_PROTECT(old_level);
 
   for (i = 0; i < MEMP_MAX; ++i) {
-    p = (struct memp *)(size_t)(memp_pools[i]->base);
+    p = (struct memp*)LWIP_MEM_ALIGN(memp_pools[i]->base);
     for (j = 0; j < memp_pools[i]->num; ++j) {
       memp_overflow_check_element_overflow(p, memp_pools[i]);
       memp_overflow_check_element_underflow(p, memp_pools[i]);