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-rw-r--r--ext/stringio/stringio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/stringio/stringio.c b/ext/stringio/stringio.c
index d15db8b0766..57854919cd6 100644
--- a/ext/stringio/stringio.c
+++ b/ext/stringio/stringio.c
@@ -1182,7 +1182,7 @@ strio_write(VALUE self, VALUE str)
ptr->pos = olen;
}
if (ptr->pos == olen) {
- rb_str_cat(ptr->string, RSTRING_PTR(str), len);
+ rb_enc_str_buf_cat(ptr->string, RSTRING_PTR(str), len, enc);
}
else {
strio_extend(ptr, ptr->pos, len);