diff --git a/src/testdir/test_fnamemodify.vim b/src/testdir/test_fnamemodify.vim
index bcbdf77..7882f3c 100644
--- a/src/testdir/test_fnamemodify.vim
+++ b/src/testdir/test_fnamemodify.vim
@@ -12,6 +12,8 @@
   call assert_equal('r', fnamemodify('.', ':p:h')[-1:])
   call assert_equal('t', fnamemodify('test.out', ':p')[-1:])
   call assert_equal($HOME .. "/foo" , fnamemodify('~/foo', ':p'))
+  call assert_equal(fnamemodify('.', ':p:h:h:h') .. '/', fnamemodify($HOME .. '/../', ':p'))
+  call assert_equal(fnamemodify('.', ':p:h:h:h') .. '/', fnamemodify($HOME .. '/..', ':p'))
   call assert_equal('test.out', fnamemodify('test.out', ':.'))
   call assert_equal('a', fnamemodify('../testdir/a', ':.'))
   call assert_equal('~/testdir/test.out', fnamemodify('test.out', ':~'))