diff --git a/OvmfPkg/AcpiTables/Facp.aslc b/OvmfPkg/AcpiTables/Facp.aslc
index b48af760ea..45bb50768f 100644
--- a/OvmfPkg/AcpiTables/Facp.aslc
+++ b/OvmfPkg/AcpiTables/Facp.aslc
@@ -1,6 +1,7 @@
 /** @file
   FACP Table
 
+  Copyright (c) 2013, Red Hat, Inc.
   Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials are
   licensed and made available under the terms and conditions of the BSD License
@@ -37,9 +38,9 @@ EFI_ACPI_1_0_FIXED_ACPI_DESCRIPTION_TABLE FACP = {
   S4BIOS_REQ,       // Value to write to SMI CMD port to enter the S4BIOS state
   0,                // PState control
   PM1a_EVT_BLK,     // Port address of Power Mgt 1a Event Reg Blk
-  PM1b_EVT_BLK,     // Port address of Power Mgt 1b Event Reg Blk
+  0,                // Power Mgt 1b Event Reg Blk unsupported
   PM1a_CNT_BLK,     // Port address of Power Mgt 1a Ctrl Reg Blk
-  PM1b_CNT_BLK,     // Port address of Power Mgt 1b Ctrl Reg Blk
+  0,                // Power Mgt 1b Ctrl Reg Blk unsupported
   PM2_CNT_BLK,      // Port address of Power Mgt 2  Ctrl Reg Blk
   PM_TMR_BLK,       // Port address of Power Mgt Timer Ctrl Reg Blk
   GPE0_BLK,         // Port addr of General Purpose Event 0 Reg Blk
diff --git a/OvmfPkg/AcpiTables/Platform.h b/OvmfPkg/AcpiTables/Platform.h
index 451238abfc..684156a475 100644
--- a/OvmfPkg/AcpiTables/Platform.h
+++ b/OvmfPkg/AcpiTables/Platform.h
@@ -35,9 +35,7 @@
 #define ACPI_DISABLE    0xF0
 #define S4BIOS_REQ      0x00
 #define PM1a_EVT_BLK    0x0000b000
-#define PM1b_EVT_BLK    0x00000000
 #define PM1a_CNT_BLK    0x0000b004
-#define PM1b_CNT_BLK    0x00000000
 #define PM2_CNT_BLK     0x00000000
 #define PM_TMR_BLK      0x0000b008
 #define GPE0_BLK        0x0000afe0