1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index b7a531498..d45018615 100644
--- a/io.c
+++ b/io.c
@@ -713,7 +713,7 @@ make_writeconv(rb_io_t *fptr)
         }
         else {
             enc = fptr->encs.enc2 ? fptr->encs.enc2 : fptr->encs.enc;
-            senc = rb_econv_stateless_encoding(enc->name);
+            senc = rb_econv_asciicompat_encoding(enc->name);
             if (!senc && !(fptr->encs.ecflags & ECONV_STATEFUL_ENCODER_MASK)) {
                 /* single conversion */
                 fptr->writeconv_pre_ecflags = ecflags;