diff --git a/include/nuttx/mm/mempool.h b/include/nuttx/mm/mempool.h
index f2344ee682..fee3447a83 100644
--- a/include/nuttx/mm/mempool.h
+++ b/include/nuttx/mm/mempool.h
@@ -34,6 +34,18 @@
 #include <nuttx/spinlock.h>
 #include <nuttx/semaphore.h>
 
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#if CONFIG_MM_BACKTRACE >= 0
+#  define MEMPOOL_REALBLOCKSIZE(pool) (ALIGN_UP(pool->blocksize + \
+                                      sizeof(struct mempool_backtrace_s), \
+                                      pool->blockalign))
+#else
+#  define MEMPOOL_REALBLOCKSIZE(pool) (pool->blocksize)
+#endif
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -70,6 +82,9 @@ struct mempool_procfs_entry_s
 struct mempool_s
 {
   size_t     blocksize;     /* The size for every block in mempool */
+#if CONFIG_MM_BACKTRACE >= 0
+  size_t     blockalign;    /* The alignment of the blocksize */
+#endif
   size_t     initialsize;   /* The initialize size in normal mempool */
   size_t     interruptsize; /* The initialize size in interrupt mempool */
   size_t     expandsize;    /* The size of expand block every time for mempool */
@@ -101,6 +116,17 @@ struct mempool_s
 #endif
 };
 
+#if CONFIG_MM_BACKTRACE >= 0
+struct mempool_backtrace_s
+{
+  FAR struct list_node node;
+  pid_t pid;
+#  if CONFIG_MM_BACKTRACE > 0
+  FAR void *backtrace[CONFIG_MM_BACKTRACE];
+#  endif
+};
+#endif
+
 struct mempoolinfo_s
 {
   unsigned long arena;    /* This is the total size of mempool */
diff --git a/mm/mempool/mempool.c b/mm/mempool/mempool.c
index 297e84a6ac..124e689d2a 100644
--- a/mm/mempool/mempool.c
+++ b/mm/mempool/mempool.c
@@ -41,21 +41,6 @@
 #undef  ALIGN_UP
 #define ALIGN_UP(x, a) (((x) + ((a) - 1)) & (~((a) - 1)))
 
-/****************************************************************************
- * Private Types
- ****************************************************************************/
-
-#if CONFIG_MM_BACKTRACE >= 0
-struct mempool_backtrace_s
-{
-  FAR struct list_node node;
-  pid_t pid;
-#  if CONFIG_MM_BACKTRACE > 0
-  FAR void *backtrace[CONFIG_MM_BACKTRACE];
-#  endif
-};
-#endif
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -143,13 +128,7 @@ static inline void mempool_add_backtrace(FAR struct mempool_s *pool,
 
 int mempool_init(FAR struct mempool_s *pool, FAR const char *name)
 {
-#if CONFIG_MM_BACKTRACE >= 0
-  size_t blocksize = ALIGN_UP(pool->blocksize +
-                              sizeof(struct mempool_backtrace_s),
-                              pool->blocksize);
-#else
-  size_t blocksize = pool->blocksize;
-#endif
+  size_t blocksize = MEMPOOL_REALBLOCKSIZE(pool);
 
   sq_init(&pool->queue);
   sq_init(&pool->iqueue);
@@ -262,13 +241,7 @@ retry:
           spin_unlock_irqrestore(&pool->lock, flags);
           if (pool->expandsize > sizeof(sq_entry_t))
             {
-#if CONFIG_MM_BACKTRACE >= 0
-              size_t blocksize = ALIGN_UP(pool->blocksize +
-                                 sizeof(struct mempool_backtrace_s),
-                                 pool->blocksize);
-#else
-              size_t blocksize = pool->blocksize;
-#endif
+              size_t blocksize = MEMPOOL_REALBLOCKSIZE(pool);
               size_t nexpand = (pool->expandsize - sizeof(sq_entry_t)) /
                                blocksize;
               size_t size = nexpand * blocksize + sizeof(sq_entry_t);
@@ -326,17 +299,13 @@ out_with_lock:
 void mempool_free(FAR struct mempool_s *pool, FAR void *blk)
 {
   irqstate_t flags = spin_lock_irqsave(&pool->lock);
+  size_t blocksize = MEMPOOL_REALBLOCKSIZE(pool);
 #if CONFIG_MM_BACKTRACE >= 0
-  size_t blocksize =  ALIGN_UP(pool->blocksize +
-                               sizeof(struct mempool_backtrace_s),
-                               pool->blocksize);
   FAR struct mempool_backtrace_s *buf =
     (FAR struct mempool_backtrace_s *)((FAR char *)blk + pool->blocksize);
 
   list_delete(&buf->node);
 #else
-  size_t blocksize = pool->blocksize;
-
   pool->nalloc--;
 #endif
 
@@ -557,13 +526,7 @@ void mempool_memdump(FAR struct mempool_s *pool, pid_t pid)
 
 int mempool_deinit(FAR struct mempool_s *pool)
 {
-#if CONFIG_MM_BACKTRACE >= 0
-  size_t blocksize = ALIGN_UP(pool->blocksize +
-                              sizeof(struct mempool_backtrace_s),
-                              pool->blocksize);
-#else
-  size_t blocksize = pool->blocksize;
-#endif
+  size_t blocksize = MEMPOOL_REALBLOCKSIZE(pool);
   FAR sq_entry_t *blk;
   size_t count = 0;
 
diff --git a/mm/mempool/mempool_multiple.c b/mm/mempool/mempool_multiple.c
index d5a7f79fac..3af1605b43 100644
--- a/mm/mempool/mempool_multiple.c
+++ b/mm/mempool/mempool_multiple.c
@@ -328,7 +328,9 @@ mempool_multiple_init(FAR const char *name,
       pools[i].alloc = mempool_multiple_alloc_callback;
       pools[i].free = mempool_multiple_free_callback;
       pools[i].calibrate = calibrate;
-
+#if CONFIG_MM_BACKTRACE >= 0
+      pools[i].blockalign = mpool->minpoolsize;
+#endif
       ret = mempool_init(pools + i, name);
       if (ret < 0)
         {
@@ -509,7 +511,7 @@ int mempool_multiple_free(FAR struct mempool_multiple_s *mpool,
 
   blk = (FAR char *)blk - (((FAR char *)blk -
                            ((FAR char *)dict->addr + mpool->minpoolsize)) %
-                           dict->pool->blocksize);
+                           MEMPOOL_REALBLOCKSIZE(dict->pool));
   mempool_free(dict->pool, blk);
   return 0;
 }