diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index f7f55aa..0a71b11 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -9,6 +9,10 @@
   call writefile(['testfile'], 'Xtestfile')
   call feedkeys(":e Xtest\t\r", "tx")
   call assert_equal('testfile', getline(1))
+
+  " Pressing <Tab> after '%' completes the current file, also on MS-Windows
+  call feedkeys(":e %\t\r", "tx")
+  call assert_equal('e Xtestfile', @:)
   call delete('Xtestfile')
 endfunc