diff --git a/include/nuttx/mm/mempool.h b/include/nuttx/mm/mempool.h
index 640c8a67266..7e64a9ae093 100644
--- a/include/nuttx/mm/mempool.h
+++ b/include/nuttx/mm/mempool.h
@@ -41,16 +41,10 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
-#if CONFIG_MM_DEFAULT_ALIGNMENT == 0
-#  define MEMPOOL_ALIGN       (2 * sizeof(uintptr_t))
-#else
-#  define MEMPOOL_ALIGN       CONFIG_MM_DEFAULT_ALIGNMENT
-#endif
-
 #if CONFIG_MM_BACKTRACE >= 0
 #  define MEMPOOL_REALBLOCKSIZE(pool) (ALIGN_UP((pool)->blocksize + \
                                        sizeof(struct mempool_backtrace_s), \
-                                       MEMPOOL_ALIGN))
+                                       MM_ALIGN))
 #else
 #  define MEMPOOL_REALBLOCKSIZE(pool) ((pool)->blocksize)
 #endif
diff --git a/include/nuttx/mm/mm.h b/include/nuttx/mm/mm.h
index de74e08f04b..6d40ae11ebd 100644
--- a/include/nuttx/mm/mm.h
+++ b/include/nuttx/mm/mm.h
@@ -156,6 +156,12 @@
 #  define MM_DUMP_LEAK(dump,pid)    (false)
 #endif
 
+#if CONFIG_MM_DEFAULT_ALIGNMENT == 0
+#  define MM_ALIGN       (2 * sizeof(uintptr_t))
+#else
+#  define MM_ALIGN       CONFIG_MM_DEFAULT_ALIGNMENT
+#endif
+
 #define MM_INIT_MAGIC    0xcc
 #define MM_ALLOC_MAGIC   0xaa
 #define MM_FREE_MAGIC    0x55
diff --git a/mm/mm_heap/mm.h b/mm/mm_heap/mm.h
index 360f450babc..6c06f733db2 100644
--- a/mm/mm_heap/mm.h
+++ b/mm/mm_heap/mm.h
@@ -34,6 +34,7 @@
 #include <nuttx/fs/procfs.h>
 #include <nuttx/lib/math32.h>
 #include <nuttx/mm/mempool.h>
+#include <nuttx/mm/mm.h>
 
 #include <assert.h>
 #include <sys/types.h>
@@ -114,11 +115,6 @@
 #define MM_MAX_CHUNK     (1 << MM_MAX_SHIFT)
 #define MM_NNODES        (MM_MAX_SHIFT - MM_MIN_SHIFT + 1)
 
-#if CONFIG_MM_DEFAULT_ALIGNMENT == 0
-#  define MM_ALIGN       (2 * sizeof(uintptr_t))
-#else
-#  define MM_ALIGN       CONFIG_MM_DEFAULT_ALIGNMENT
-#endif
 #define MM_GRAN_MASK     (MM_ALIGN - 1)
 #define MM_ALIGN_UP(a)   (((a) + MM_GRAN_MASK) & ~MM_GRAN_MASK)
 #define MM_ALIGN_DOWN(a) ((a) & ~MM_GRAN_MASK)