diff --git a/lib/tarantino/router.js b/lib/tarantino/router.js
index 8ed51d9..d169527 100644
--- a/lib/tarantino/router.js
+++ b/lib/tarantino/router.js
@@ -775,6 +775,7 @@ Router.prototype.mount = function(routes, path) {
   path = path || [];
   if (!Array.isArray(path)) {
     path = path.split(self.delimiter);
+    path = terminator(path, self.delimiter);
   }
 
   function insertOrMount(route, local) {
@@ -791,6 +792,7 @@ Router.prototype.mount = function(routes, path) {
 
     if (isRoute && routeType === 'object' && !Array.isArray(routes[route])) {
       local = local.concat(parts);
+      local = terminator(local, self.delimiter);
       self.mount(routes[route], local);
       return;
     }
diff --git a/test/server/core/mount-test.js b/test/server/core/mount-test.js
index 3077628..739e7cc 100644
--- a/test/server/core/mount-test.js
+++ b/test/server/core/mount-test.js
@@ -85,6 +85,18 @@ vows.describe('tarantino/core/mount').addBatch({
           '/api');
 
           assertRoute(dogs, ['api', 'dogs', 'on'], router.routes);
+        },
+
+        "should fix unterminated RegExp groups": function(router) {
+          function cat () { }
+
+          router.mount({
+            '/(nyan/)?cat': {
+              on: cat
+            }
+          });
+
+          assertRoute(cat, ['(nyan/)?cat', 'on'], router.routes);
         }
       }
     },