diff --git a/mm/mempool/mempool.c b/mm/mempool/mempool.c
index 89b3f80e24..a476480342 100644
--- a/mm/mempool/mempool.c
+++ b/mm/mempool/mempool.c
@@ -41,8 +41,8 @@
  ****************************************************************************/
 
 #if CONFIG_MM_BACKTRACE >= 0
-#define MEMPOOL_MAGIC_FREE  0xAAAAAAAA
-#define MEMPOOL_MAGIC_ALLOC 0x55555555
+#define MEMPOOL_MAGIC_FREE  0x55555555
+#define MEMPOOL_MAGIC_ALLOC 0xAAAAAAAA
 
 /****************************************************************************
  * Private Types