diff --git a/PcAtChipsetPkg/Library/AcpiTimerLib/PeiAcpiTimerLib.c b/PcAtChipsetPkg/Library/AcpiTimerLib/PeiAcpiTimerLib.c
index 45a341f6e17f..a504bd8a3c92 100644
--- a/PcAtChipsetPkg/Library/AcpiTimerLib/PeiAcpiTimerLib.c
+++ b/PcAtChipsetPkg/Library/AcpiTimerLib/PeiAcpiTimerLib.c
@@ -16,6 +16,7 @@
 #include <Library/TimerLib.h>
 #include <Library/BaseLib.h>
 #include <Library/HobLib.h>
+#include <Library/DebugLib.h>
 
 extern GUID mFrequencyHobGuid;