diff --git a/src/testdir/test_fnamemodify.vim b/src/testdir/test_fnamemodify.vim
index c19f464..4e61343 100644
--- a/src/testdir/test_fnamemodify.vim
+++ b/src/testdir/test_fnamemodify.vim
@@ -14,6 +14,8 @@
   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(fnamemodify('.', ':p:h:h') .. '/', fnamemodify('../', ':p'))
+  call assert_equal(fnamemodify('.', ':p:h:h') .. '/', fnamemodify('..', ':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', ':~'))