diff --git a/qemu-8.0.0/roms/edk2/MdeModulePkg/Universal/RegularExpressionDxe/oniguruma/src/regcomp.c b/qemu-8.0.0/roms/edk2/MdeModulePkg/Universal/RegularExpressionDxe/oniguruma/src/regcomp.c
index f61e89260ba..8fd8c48be1d 100644
--- a/qemu-8.0.0/roms/edk2/MdeModulePkg/Universal/RegularExpressionDxe/oniguruma/src/regcomp.c
+++ b/qemu-8.0.0/roms/edk2/MdeModulePkg/Universal/RegularExpressionDxe/oniguruma/src/regcomp.c
@@ -6202,7 +6202,7 @@ concat_opt_exact_str(OptStr* to, UChar* s, UChar* end, OnigEncoding enc)
 
   for (i = to->len, p = s; p < end && i < OPT_EXACT_MAXLEN; ) {
     len = enclen(enc, p);
-    if (i + len > OPT_EXACT_MAXLEN) break;
+    if (i + len >= OPT_EXACT_MAXLEN) break;
     for (j = 0; j < len && p < end; j++)
       to->s[i++] = *p++;
   }