diff --git a/file.c b/file.c
index 5644656b44..c46377b933 100644
--- a/file.c
+++ b/file.c
@@ -237,7 +237,7 @@ rb_str_encode_ospath(VALUE path)
 {
 #if USE_OSPATH
     int encidx = ENCODING_GET(path);
-#ifdef _WIN32
+#if 0 && defined _WIN32
     if (encidx == ENCINDEX_ASCII) {
 	encidx = rb_filesystem_encindex();
     }