diff --git a/configs/turris_omnia_defconfig b/configs/turris_omnia_defconfig
index 07d8612..fff9873 100644
--- a/configs/turris_omnia_defconfig
+++ b/configs/turris_omnia_defconfig
@@ -33,6 +33,8 @@
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_ALT_MEMTEST=y
+CONFIG_SYS_MEMTEST_START=0x00800000
+CONFIG_SYS_MEMTEST_END=0x00ffffff
 CONFIG_CMD_SHA1SUM=y
 CONFIG_CMD_LZMADEC=y
 CONFIG_CMD_GPIO=y