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