diff --git a/src/arch/x86/include/arch/acpigen.h b/src/arch/x86/include/arch/acpigen.h
index 0f11226eb0..6fd9f73e05 100644
--- a/src/arch/x86/include/arch/acpigen.h
+++ b/src/arch/x86/include/arch/acpigen.h
@@ -87,7 +87,7 @@ enum {
 	 BANK_FIELD_OP		= 0x87,
 	 DATA_REGION_OP		= 0x88,
 	ROOT_PREFIX		= 0x5C,
-	PARENT_PREFIX		= 0x5D,
+	PARENT_PREFIX		= 0x5E,
 	LOCAL0_OP		= 0x60,
 	LOCAL1_OP		= 0x61,
 	LOCAL2_OP		= 0x62,