1 files changed, 1 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index c5327fca60..8267658f5c 100644
--- a/marshal.c
+++ b/marshal.c
@@ -481,7 +481,7 @@ w_symbol(VALUE sym, struct dump_arg *arg)
 	}
 	encname = encoding_name(sym, arg);
 	if (NIL_P(encname) ||
-	    rb_enc_str_coderange(sym) == ENC_CODERANGE_7BIT) {
+	    is_ascii_string(sym)) {
 	    encname = Qnil;
 	}
 	else {