diff --git a/configs/P1020RDB-PC_36BIT_defconfig b/configs/P1020RDB-PC_36BIT_defconfig
index 2553c6c..20bc920 100644
--- a/configs/P1020RDB-PC_36BIT_defconfig
+++ b/configs/P1020RDB-PC_36BIT_defconfig
@@ -6,6 +6,7 @@
 CONFIG_DEFAULT_DEVICE_TREE="p1020rdb-pc_36b"
 CONFIG_ENV_ADDR=0xEFF20000
 CONFIG_MPC85xx=y
+CONFIG_SYS_INIT_RAM_LOCK=y
 # CONFIG_CMD_ERRATA is not set
 CONFIG_TARGET_P1020RDB_PC=y
 CONFIG_MPC85XX_HAVE_RESET_VECTOR=y