diff --git a/src/testdir/test_window_cmd.vim b/src/testdir/test_window_cmd.vim
index b0c5a41..8a97488 100644
--- a/src/testdir/test_window_cmd.vim
+++ b/src/testdir/test_window_cmd.vim
@@ -1154,7 +1154,7 @@
   wincmd l
   let other_winnr = winnr('h')
   call assert_notequal(winnr(), other_winnr)
-  exe 'vert ' .. other_winnr .. 'resize -100'
+  exe 'vert ' .. other_winnr .. 'resize -' .. &columns
   call assert_equal(0, winwidth(other_winnr))
 
   %bwipe!