diff --git a/src/testdir/test64.in b/src/testdir/test64.in
index 0cabcdf..061f1f1 100644
--- a/src/testdir/test64.in
+++ b/src/testdir/test64.in
@@ -366,6 +366,7 @@
 :call add(tl, [2, '\%[bar]x', 'barxx', 'barx'])
 :call add(tl, [2, '\%[bar]x', 'bxx', 'bx'])
 :call add(tl, [2, '\%[bar]x', 'xxx', 'x'])
+:call add(tl, [2, 'b\%[[ao]r]', 'bar bor', 'bar'])
 :"
 :"""" Alternatives, must use first longest match
 :call add(tl, [2, 'goo\|go', 'google', 'goo'])
diff --git a/src/testdir/test64.ok b/src/testdir/test64.ok
index fda5892..7021d18 100644
--- a/src/testdir/test64.ok
+++ b/src/testdir/test64.ok
@@ -836,6 +836,9 @@
 OK 0 - \%[bar]x
 OK 1 - \%[bar]x
 OK 2 - \%[bar]x
+OK 0 - b\%[[ao]r]
+OK 1 - b\%[[ao]r]
+OK 2 - b\%[[ao]r]
 OK 0 - goo\|go
 OK 1 - goo\|go
 OK 2 - goo\|go