diff --git a/MdeModulePkg/Include/Library/ResetSystemLib.h b/MdeModulePkg/Include/Library/ResetSystemLib.h
index 3b2a098a60..09ee14540c 100644
--- a/MdeModulePkg/Include/Library/ResetSystemLib.h
+++ b/MdeModulePkg/Include/Library/ResetSystemLib.h
@@ -51,17 +51,6 @@ ResetShutdown (
   VOID
   );
 
-/**
-  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
-  );
-
 /**
   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
diff --git a/MdeModulePkg/Library/BaseResetSystemLibNull/BaseResetSystemLibNull.c b/MdeModulePkg/Library/BaseResetSystemLibNull/BaseResetSystemLibNull.c
index 8d4c1028e6..33a896bee0 100644
--- a/MdeModulePkg/Library/BaseResetSystemLibNull/BaseResetSystemLibNull.c
+++ b/MdeModulePkg/Library/BaseResetSystemLibNull/BaseResetSystemLibNull.c
@@ -58,20 +58,6 @@ ResetShutdown (
   ASSERT (FALSE);
 }
 
-/**
-  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
-  )
-{
-  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
diff --git a/MdeModulePkg/Library/DxeResetSystemLib/DxeResetSystemLib.c b/MdeModulePkg/Library/DxeResetSystemLib/DxeResetSystemLib.c
index a85b6cd9a6..47b814fe8d 100644
--- a/MdeModulePkg/Library/DxeResetSystemLib/DxeResetSystemLib.c
+++ b/MdeModulePkg/Library/DxeResetSystemLib/DxeResetSystemLib.c
@@ -57,19 +57,6 @@ ResetShutdown (
   gRT->ResetSystem (EfiResetShutdown, EFI_SUCCESS, 0, NULL);
 }
 
-/**
-  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
-  )
-{
-}
-
 /**
   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
diff --git a/MdeModulePkg/Library/PeiResetSystemLib/PeiResetSystemLib.c b/MdeModulePkg/Library/PeiResetSystemLib/PeiResetSystemLib.c
index 50297129b7..6c8c770ca3 100644
--- a/MdeModulePkg/Library/PeiResetSystemLib/PeiResetSystemLib.c
+++ b/MdeModulePkg/Library/PeiResetSystemLib/PeiResetSystemLib.c
@@ -57,19 +57,6 @@ ResetShutdown (
   PeiServicesResetSystem2 (EfiResetShutdown, EFI_SUCCESS, 0, NULL);
 }
 
-/**
-  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
-  )
-{
-}
-
 /**
   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
diff --git a/MdeModulePkg/Library/RuntimeResetSystemLib/RuntimeResetSystemLib.c b/MdeModulePkg/Library/RuntimeResetSystemLib/RuntimeResetSystemLib.c
index 29b3f7ebd8..f4490180cc 100644
--- a/MdeModulePkg/Library/RuntimeResetSystemLib/RuntimeResetSystemLib.c
+++ b/MdeModulePkg/Library/RuntimeResetSystemLib/RuntimeResetSystemLib.c
@@ -62,19 +62,6 @@ ResetShutdown (
   mInternalRT->ResetSystem (EfiResetShutdown, EFI_SUCCESS, 0, NULL);
 }
 
-/**
-  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
-  )
-{
-}
-
 /**
   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