diff --git a/src/testdir/test_excmd.vim b/src/testdir/test_excmd.vim
index 868ac6f..2428e9d 100644
--- a/src/testdir/test_excmd.vim
+++ b/src/testdir/test_excmd.vim
@@ -371,6 +371,11 @@
   close
 
   call assert_fails("call feedkeys(\":\<C-R>=execute('bnext')\<CR>\", 'xt')", 'E565:')
+
+  " :tabfirst
+  tabnew
+  call assert_fails("call feedkeys(\":\<C-R>=execute('tabfirst')\<CR>\", 'xt')", 'E565:')
+  tabclose
 endfunc
 
 " Test for the :verbose command