diff --git a/PcAtChipsetPkg/PcAtChipsetPkg.dsc b/PcAtChipsetPkg/PcAtChipsetPkg.dsc
index 0321bb2bbc..25bb894f49 100644
--- a/PcAtChipsetPkg/PcAtChipsetPkg.dsc
+++ b/PcAtChipsetPkg/PcAtChipsetPkg.dsc
@@ -59,3 +59,6 @@
   PcAtChipsetPkg/Library/AcpiTimerLib/BaseAcpiTimerLib.inf
   PcAtChipsetPkg/Library/AcpiTimerLib/DxeAcpiTimerLib.inf
   PcAtChipsetPkg/PcatRealTimeClockRuntimeDxe/PcatRealTimeClockRuntimeDxe.inf
+
+[BuildOptions]
+  *_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES