Using is_ascii_string to check encoding

1 files changed, 1 insertions, 1 deletions

diff --git a/file.c b/file.c
index 007a9cb88e..e92ceeabe1 100644
--- a/file.c
+++ b/file.c
@@ -4001,7 +4001,7 @@ rb_file_expand_path_internal(VALUE fname, VALUE dname, int abs_mode, int long_na
 	rb_str_set_len(result, p - buf + strlen(p));
 	encidx = ENCODING_GET(result);
 	tmp = result;
-	if (encidx != ENCINDEX_UTF_8 && rb_enc_str_coderange(result) != ENC_CODERANGE_7BIT) {
+	if (encidx != ENCINDEX_UTF_8 && !is_ascii_string(result)) {
 	    tmp = rb_str_encode_ospath(result);
 	}
 	len = MultiByteToWideChar(CP_UTF8, 0, RSTRING_PTR(tmp), -1, NULL, 0);