diff --git a/src/testdir/test_checkpath.vim b/src/testdir/test_checkpath.vim
index 28e9105..f6a3bbc 100644
--- a/src/testdir/test_checkpath.vim
+++ b/src/testdir/test_checkpath.vim
@@ -103,4 +103,19 @@
   set includeexpr&
 endfunc
 
+" Test for invalid regex in 'include' and 'define' options
+func Test_checkpath_errors()
+  let save_include = &include
+  set include=\\%(
+  call assert_fails('checkpath', 'E53:')
+  let &include = save_include
+
+  let save_define = &define
+  set define=\\%(
+  call assert_fails('dsearch abc', 'E53:')
+  let &define = save_define
+
+  call assert_fails('psearch \%(', 'E53:')
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab