diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index 9970d1479e..2cc4c7e973 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -322,6 +322,7 @@ BootModeInitialization (
   if (CmosRead8 (0xF) == 0xFE) {
     mBootMode = BOOT_ON_S3_RESUME;
   }
+  CmosWrite8 (0xF, 0x00);
 
   Status = PeiServicesSetBootMode (mBootMode);
   ASSERT_EFI_ERROR (Status);