diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 66459c2..1cca655 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -83,7 +83,12 @@
   PciLib|MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf
   IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
   OemHookStatusCodeLib|MdeModulePkg/Library/OemHookStatusCodeLibNull/OemHookStatusCodeLibNull.inf
+!ifdef $(DEBUG_ON_SERIAL_PORT)
   SerialPortLib|PcAtChipsetPkg/Library/SerialIoLib/SerialIoLib.inf
+!else
+  SerialPortLib|OvmfPkg/Library/BaseSerialPortLibIoPort/BaseSerialPortLibIoPort.inf
+!endif
+  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
   MtrrLib|UefiCpuPkg/Library/MtrrLib/MtrrLib.inf
   UefiLib|MdePkg/Library/UefiLib/UefiLib.inf
   UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
@@ -136,11 +141,6 @@
 
 [LibraryClasses.common.SEC]
   QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSecLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   ReportStatusCodeLib|MdeModulePkg/Library/PeiReportStatusCodeLib/PeiReportStatusCodeLib.inf
   ExtractGuidedSectionLib|MdePkg/Library/BaseExtractGuidedSectionLib/BaseExtractGuidedSectionLib.inf
 !ifdef $(SOURCE_DEBUG_ENABLE)
@@ -161,11 +161,6 @@
   ReportStatusCodeLib|MdeModulePkg/Library/PeiReportStatusCodeLib/PeiReportStatusCodeLib.inf
   OemHookStatusCodeLib|MdeModulePkg/Library/OemHookStatusCodeLibNull/OemHookStatusCodeLibNull.inf
   PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   PeCoffLib|MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
 
 [LibraryClasses.common.PEIM]
@@ -177,11 +172,6 @@
   ReportStatusCodeLib|MdeModulePkg/Library/PeiReportStatusCodeLib/PeiReportStatusCodeLib.inf
   OemHookStatusCodeLib|MdeModulePkg/Library/OemHookStatusCodeLibNull/OemHookStatusCodeLibNull.inf
   PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   PeCoffLib|MdePkg/Library/BasePeCoffLib/BasePeCoffLib.inf
   PeiResourcePublicationLib|MdePkg/Library/PeiResourcePublicationLib/PeiResourcePublicationLib.inf
   ExtractGuidedSectionLib|MdePkg/Library/PeiExtractGuidedSectionLib/PeiExtractGuidedSectionLib.inf
@@ -194,11 +184,6 @@
   DxeCoreEntryPoint|MdePkg/Library/DxeCoreEntryPoint/DxeCoreEntryPoint.inf
   MemoryAllocationLib|MdeModulePkg/Library/DxeCoreMemoryAllocationLib/DxeCoreMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   ExtractGuidedSectionLib|MdePkg/Library/DxeExtractGuidedSectionLib/DxeExtractGuidedSectionLib.inf
 !ifdef $(SOURCE_DEBUG_ENABLE)
@@ -211,11 +196,6 @@
   DxeCoreEntryPoint|MdePkg/Library/DxeCoreEntryPoint/DxeCoreEntryPoint.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/RuntimeDxeReportStatusCodeLib/RuntimeDxeReportStatusCodeLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   PcdLib|MdePkg/Library/DxePcdLib/DxePcdLib.inf
   UefiRuntimeLib|MdePkg/Library/UefiRuntimeLib/UefiRuntimeLib.inf
 !if $(SECURE_BOOT_ENABLE) == TRUE
@@ -227,11 +207,6 @@
   DxeCoreEntryPoint|MdePkg/Library/DxeCoreEntryPoint/DxeCoreEntryPoint.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
   UefiScsiLib|MdePkg/Library/UefiScsiLib/UefiScsiLib.inf
 
@@ -241,11 +216,6 @@
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
   ReportStatusCodeLib|MdeModulePkg/Library/DxeReportStatusCodeLib/DxeReportStatusCodeLib.inf
   UefiScsiLib|MdePkg/Library/UefiScsiLib/UefiScsiLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
   NetLib|MdeModulePkg/Library/DxeNetLib/DxeNetLib.inf
   IpIoLib|MdeModulePkg/Library/DxeIpIoLib/DxeIpIoLib.inf
   UdpIoLib|MdeModulePkg/Library/DxeUdpIoLib/DxeUdpIoLib.inf
@@ -260,11 +230,6 @@
 [LibraryClasses.common.UEFI_APPLICATION]
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
-!ifdef $(DEBUG_ON_SERIAL_PORT)
-  DebugLib|MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
-!else
-  DebugLib|OvmfPkg/Library/PlatformDebugLibIoPort/PlatformDebugLibIoPort.inf
-!endif
 
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