diff --git a/configs/wb50n_defconfig b/configs/wb50n_defconfig
index 25a6edd..86a8549 100644
--- a/configs/wb50n_defconfig
+++ b/configs/wb50n_defconfig
@@ -20,6 +20,8 @@
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_SYS_ALT_MEMTEST=y
+CONFIG_SYS_MEMTEST_START=0x21000000
+CONFIG_SYS_MEMTEST_END=0x22000000
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_LOADS is not set
 CONFIG_CMD_NAND=y