diff --git a/src/lv_misc/lv_mem.c b/src/lv_misc/lv_mem.c
index 9812a95c4..116208ea8 100644
--- a/src/lv_misc/lv_mem.c
+++ b/src/lv_misc/lv_mem.c
@@ -19,7 +19,9 @@
  *      DEFINES
  *********************/
 /*Add memory junk on alloc (0xaa) and free(0xbb) (just for testing purposes)*/
-#define LV_MEM_ADD_JUNK 1
+#ifndef LV_MEM_ADD_JUNK
+#define LV_MEM_ADD_JUNK 0
+#endif
 
 #ifdef LV_MEM_ENV64
 #define MEM_UNIT uint64_t