diff --git a/ArmVirtPkg/Library/ArmVirtPsciResetSystemLib/ArmVirtPsciResetSystemLib.c b/ArmVirtPkg/Library/ArmVirtPsciResetSystemLib/ArmVirtPsciResetSystemLib.c
index fdf49e1d9c..9e5b70e2c5 100644
--- a/ArmVirtPkg/Library/ArmVirtPsciResetSystemLib/ArmVirtPsciResetSystemLib.c
+++ b/ArmVirtPkg/Library/ArmVirtPsciResetSystemLib/ArmVirtPsciResetSystemLib.c
@@ -145,20 +145,6 @@ ResetShutdown (
   }
 }
 
-/**
-  This function causes the system to enter S3 and then wake up immediately.
-
-  If this function returns, it means that the system does not support S3 feature.
-**/
-VOID
-EFIAPI
-EnterS3WithImmediateWake (
-  VOID
-  )
-{
-  // not implemented
-}
-
 /**
   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