diff --git a/board/olpc/xo-1/linux.config b/board/olpc/xo-1/linux.config
index 356fbd6071..2541a310a5 100644
--- a/board/olpc/xo-1/linux.config
+++ b/board/olpc/xo-1/linux.config
@@ -6,7 +6,7 @@ CONFIG_HZ_100=y
 CONFIG_KEXEC=y
 CONFIG_PHYSICAL_START=0x400000
 CONFIG_CMDLINE_BOOL=y
-# CONFIG_ACPI is not set
+CONFIG_ACPI=y
 CONFIG_CPU_IDLE=y
 CONFIG_CPU_IDLE_GOV_LADDER=y
 CONFIG_OLPC=y