diff --git a/src/testdir/test_syntax.vim b/src/testdir/test_syntax.vim
index e49c8ed..ffa8e90 100644
--- a/src/testdir/test_syntax.vim
+++ b/src/testdir/test_syntax.vim
@@ -562,3 +562,15 @@
   let $COLORFGBG = ''
   call delete('Xtest.c')
 endfun
+
+" Using \z() in a region with NFA failing should not crash.
+func Test_syn_wrong_z_one()
+  new
+  call setline(1, ['just some text', 'with foo and bar to match with'])
+  syn region FooBar start="foo\z(.*\)bar" end="\z1"
+  call test_override("nfa_fail", 1)
+  redraw!
+  redraw!
+  call test_override("ALL", 0)
+  bwipe!
+endfunc