1 files changed, 1 insertions, 1 deletions
diff --git a/io.c b/io.c
index 6c9707ab48..39ee4d7c2f 100644
--- a/io.c
+++ b/io.c
@@ -4606,7 +4606,7 @@ rb_scan_open_args(int argc, VALUE *argv,
 	    static VALUE fs_enc;
 	    if (!fs_enc)
 		fs_enc = rb_enc_from_encoding(fs_encoding);
-	    fname = rb_str_transcode(fname, fs_enc, 0);
+	    fname = rb_str_transcode(fname, fs_enc, 0, Qnil);
 	}
     }
 #endif