1 files changed, 2 insertions, 0 deletions
diff --git a/regenc.c b/regenc.c
index 75a6a039ce..5afa1807b9 100644
--- a/regenc.c
+++ b/regenc.c
@@ -629,6 +629,8 @@ onigenc_single_byte_code_to_mbclen(OnigCodePoint code ARG_UNUSED, OnigEncoding e
 extern int
 onigenc_single_byte_code_to_mbc(OnigCodePoint code, UChar *buf, OnigEncoding enc ARG_UNUSED)
 {
+  if (code > 0xff)
+      rb_raise(rb_eRangeError, "%"PRIdVALUE " out of char range", code);
   *buf = (UChar )(code & 0xff);
   return 1;
 }