diff --git a/OvmfPkg/Tcg/TpmMmioSevDecryptPei/TpmMmioSevDecryptPeim.c b/OvmfPkg/Tcg/TpmMmioSevDecryptPei/TpmMmioSevDecryptPeim.c
index df2ad62330..570c8467a6 100644
--- a/OvmfPkg/Tcg/TpmMmioSevDecryptPei/TpmMmioSevDecryptPeim.c
+++ b/OvmfPkg/Tcg/TpmMmioSevDecryptPei/TpmMmioSevDecryptPeim.c
@@ -62,11 +62,10 @@ TpmMmioSevDecryptPeimEntryPoint (
       "%a: mapping TPM MMIO address range unencrypted\n",
       __FUNCTION__));
 
-    DecryptStatus = MemEncryptSevClearPageEncMask (
+    DecryptStatus = MemEncryptSevClearMmioPageEncMask (
                       0,
                       FixedPcdGet64 (PcdTpmBaseAddress),
-                      EFI_SIZE_TO_PAGES ((UINTN) 0x5000),
-                      FALSE
+                      EFI_SIZE_TO_PAGES ((UINTN) 0x5000)
                       );
 
     if (RETURN_ERROR (DecryptStatus)) {