diff --git a/src/testdir/test64.in b/src/testdir/test64.in
index b29fe76..ac3f13d 100644
--- a/src/testdir/test64.in
+++ b/src/testdir/test64.in
@@ -421,6 +421,9 @@
 :call add(tl, [2, '\(foo\)\@<=\>', 'barfoo', '', 'foo'])
 :call add(tl, [2, '\(foo\)\@<=.*', 'foobar', 'bar', 'foo'])
 :"
+:" complicated look-behind match
+:call add(tl, [2, '\(r\@<=\|\w\@<!\)\/', 'x = /word/;', '/'])
+:"
 :""""" \@>
 :call add(tl, [2, '\(a*\)\@>a', 'aaaa'])
 :call add(tl, [2, '\(a*\)\@>b', 'aaab', 'aaab', 'aaa'])
diff --git a/src/testdir/test64.ok b/src/testdir/test64.ok
index 733ad87..da19c04 100644
--- a/src/testdir/test64.ok
+++ b/src/testdir/test64.ok
@@ -974,6 +974,9 @@
 OK 0 - \(foo\)\@<=.*
 OK 1 - \(foo\)\@<=.*
 OK 2 - \(foo\)\@<=.*
+OK 0 - \(r\@<=\|\w\@<!\)\/
+OK 1 - \(r\@<=\|\w\@<!\)\/
+OK 2 - \(r\@<=\|\w\@<!\)\/
 OK 0 - \(a*\)\@>a
 OK 1 - \(a*\)\@>a
 OK 2 - \(a*\)\@>a