diff --git a/configs/P1020RDB-PC_36BIT_NAND_defconfig b/configs/P1020RDB-PC_36BIT_NAND_defconfig
index 6d0160b..96bc964 100644
--- a/configs/P1020RDB-PC_36BIT_NAND_defconfig
+++ b/configs/P1020RDB-PC_36BIT_NAND_defconfig
@@ -13,6 +13,7 @@
 CONFIG_SPL=y
 CONFIG_TPL_MAX_SIZE=0x20000
 CONFIG_MPC85xx=y
+CONFIG_SYS_INIT_RAM_LOCK=y
 # CONFIG_CMD_ERRATA is not set
 CONFIG_TARGET_P1020RDB_PC=y
 CONFIG_ENABLE_36BIT_PHYS=y