diff --git a/src/testdir/test_textformat.vim b/src/testdir/test_textformat.vim
index a49ef5c..74d6bfe 100644
--- a/src/testdir/test_textformat.vim
+++ b/src/testdir/test_textformat.vim
@@ -425,12 +425,13 @@
   enew!
 
   " align text with 'wrapmargin'
+  50vnew
   call setline(1, ['Vim'])
-  set textwidth=0
-  set wrapmargin=60
+  setl textwidth=0
+  setl wrapmargin=30
   right
   call assert_equal("\t\t Vim", getline(1))
-  set wrapmargin&
+  q!
 
   set tw&
 endfunc