diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index 108ee50..dff8e36 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -439,6 +439,9 @@
   let s:fref = function(s:f)
   call assert_equal(v:t_string, s:fref('x'))
   call assert_fails("call function('s:f')", 'E700:')
+
+  call assert_fails("call function('foo()')", 'E475:')
+  call assert_fails("call function('foo()')", 'foo()')
 endfunc
 
 func Test_funcref()