diff --git a/index.js b/index.js
index 99b28a3..d7b9c31 100644
--- a/index.js
+++ b/index.js
@@ -41,7 +41,7 @@ function routeToRegExp(src) {
   keys = keys.reduce(function(memo, key) {
     var value = '\\' + key;
 
-    memo[key] = new RegExp(value + '(\\/|\\)|$)');
+    memo[key] = new RegExp(value + '(\\/|\\)|\\(|$)');
 
     return memo;
   }, {});
diff --git a/package.json b/package.json
index cc24417..69c2804 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "docuri",
-  "version": "4.0.1",
+  "version": "4.0.2",
   "description": "Rich document ids for CouchDB",
   "main": "index.js",
   "scripts": {
diff --git a/test/named-parameter-test.js b/test/named-parameter-test.js
index 79b4700..bfc414e 100644
--- a/test/named-parameter-test.js
+++ b/test/named-parameter-test.js
@@ -18,3 +18,12 @@ test('two named parameters', function(t) {
 
   t.end();
 });
+
+test('named parameter followed by optional parameter', function(t) {
+  docuri.route('page/:id(/:optional)', 'page');
+
+  t.deepEqual(docuri.page('page/mypage'), { id: 'mypage' }, 'parsed page has "id" set to "mypage"');
+  t.equal(docuri.page({ id: 'mypage', optional: 'number' }), 'page/mypage/number', 'stringified page results in "page/mypage/number"');
+
+  t.end();
+});