diff --git a/src/testdir/test_listchars.in b/src/testdir/test_listchars.in
index 1f19afa..241b541 100644
--- a/src/testdir/test_listchars.in
+++ b/src/testdir/test_listchars.in
@@ -2,6 +2,7 @@
 
 STARTTEST
 :so small.vim
+:set ff=unix
 :let g:lines = []
 :function GetScreenCharsForLine(lnum)
 :  return join(map(range(1, virtcol('$')), 'nr2char(screenchar(a:lnum, v:val))'), '')