diff --git a/lib/restify-session.js b/lib/restify-session.js
index 0c6ce31..0d6bb24 100644
--- a/lib/restify-session.js
+++ b/lib/restify-session.js
@@ -485,6 +485,9 @@ module.exports = function(config) {
       cfg.logger.debug(session.name + ': request url: ' + req.url);
     }
     var reqSid = req.headers[session.config.sidHeader.toLowerCase()];
+    if(!reqSid && req.cookies) {
+      reqSid = req.cookies[session.config.sidHeader.toLowerCase()];
+    }
     session.exists(reqSid, function(existErr, active){
       if (existErr) {
         next();