diff --git a/tests/data/test1908 b/tests/data/test1908
index 236bd4af0e..bf23ef9fce 100644
--- a/tests/data/test1908
+++ b/tests/data/test1908
@@ -62,7 +62,7 @@ Accept: */*
 # matches
 s/\"([^\"]*)\"/TIMESTAMP/
 </stripfile>
-<file name="log/altsvc-1908">
+<file name="log/altsvc-1908" mode="text">
 # Your alt-svc cache. https://curl.haxx.se/docs/alt-svc.html
 # This file was generated by libcurl! Edit at your own risk.
 h1 127.0.0.1 %HTTPPORT h2 3dbbdetxoyw4nsp6c3cc456oj2ays6s43ezxzsfxxri3h5xqd.example 443 TIMESTAMP 1 0