diff --git a/mm/Kconfig b/mm/Kconfig
index 71a95c80fa..6d702f7629 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -63,7 +63,7 @@ config MM_KERNEL_HEAPSIZE
 
 config MM_DFAULT_ALIGNMENT
 	int "Memory default alignment in bytes"
-	default 8
+	default 0
 	range 0 64
 	---help---
 		The memory default alignment in bytes, if this value is 0, the real
diff --git a/mm/mm_heap/mm.h b/mm/mm_heap/mm.h
index adc6f24d28..c787ace6af 100644
--- a/mm/mm_heap/mm.h
+++ b/mm/mm_heap/mm.h
@@ -111,7 +111,7 @@
 #define MM_NNODES        (MM_MAX_SHIFT - MM_MIN_SHIFT + 1)
 
 #if CONFIG_MM_DFAULT_ALIGNMENT == 0
-#  define MM_ALIGN       sizeof(uintptr_t)
+#  define MM_ALIGN       (2 * sizeof(uintptr_t))
 #else
 #  define MM_ALIGN       CONFIG_MM_DFAULT_ALIGNMENT
 #endif