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-rw-r--r--string.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/string.c b/string.c
index 34f35b8b29d..6e6db0053a4 100644
--- a/string.c
+++ b/string.c
@@ -4871,7 +4871,8 @@ tr_trans(VALUE str, VALUE src, VALUE repl, int sflag)
if (r == errc) r = trrepl.now;
if (c < 256) {
trans[c] = r;
- if (r > 255) singlebyte = 0;
+ if (r > 255 || (r > 127 && rb_enc_mbmaxlen(enc) != 1))
+ singlebyte = 0;
}
else {
if (!hash) hash = rb_hash_new();