diff --git a/PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c b/PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c
index 7fe1663c97..e42c41c48e 100644
--- a/PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c
+++ b/PcAtChipsetPkg/Library/ResetSystemLib/ResetSystemLib.c
@@ -65,23 +65,6 @@ ResetShutdown (
 }
 
 
-/**
-  Calling this function causes the system to enter a power state for capsule
-  update.
-
-  Reset update should not return, if it returns, it means the system does
-  not support capsule update.
-
-**/
-VOID
-EFIAPI
-EnterS3WithImmediateWake (
-  VOID
-  )
-{
-  ASSERT (FALSE);
-}
-
 /**
   This function causes a systemwide reset. The exact type of the reset is
   defined by the EFI_GUID that follows the Null-terminated Unicode string passed