diff --git a/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c b/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
index 43d78a6a07..f29c47b7b4 100644
--- a/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
+++ b/MdeModulePkg/Universal/SmbiosDxe/SmbiosDxe.c
@@ -665,7 +665,7 @@ SmbiosUpdateString (
       //
       TargetStrLen = AsciiStrLen(StrStart);
       if (InputStrLen == TargetStrLen) {
-        AsciiStrCpy(StrStart, String);
+        AsciiStrCpyS(StrStart, TargetStrLen + 1, String);
         //
         // Some UEFI drivers (such as network) need some information in SMBIOS table.
         // Here we create SMBIOS table and publish it in