diff --git a/configs/sandbox_flattree_defconfig b/configs/sandbox_flattree_defconfig
index 00d9359..a4a7ae8 100644
--- a/configs/sandbox_flattree_defconfig
+++ b/configs/sandbox_flattree_defconfig
@@ -29,6 +29,8 @@
 CONFIG_CMD_MEMINFO=y
 CONFIG_CMD_MX_CYCLIC=y
 CONFIG_CMD_MEMTEST=y
+CONFIG_SYS_MEMTEST_START=0x00100000
+CONFIG_SYS_MEMTEST_END=0x00101000
 CONFIG_CMD_DEMO=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y