diff --git a/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c b/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
index dd240d88d0..fe18878d19 100644
--- a/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
+++ b/MdePkg/Library/BaseTimerLibLocalApic/x86TimerLib.c
@@ -210,7 +210,8 @@ GetPerformanceCounter (
   VOID
   )
 {
-  return (UINT32)InternalX86GetTimerTick (InternalX86GetApicBase ());
+  volatile static UINT64 Mask = 0xffffffff;
+  return InternalX86GetTimerTick (InternalX86GetApicBase ()) & Mask;
 }
 
 /**