diff --git a/lib/config.js b/lib/config.js
index 3bb2f964..18a79050 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -225,7 +225,7 @@ function preprocessConfig(cfg) {
     // HTTP/HTTPS domains with port numbers
     if (!cfg.http["full-address"]) {
         var httpfa = cfg.http.domain;
-        if (cfg.http.port !== 80) {
+        if (cfg.http["default-port"] !== 80) {
             httpfa += ":" + cfg.http["default-port"];
         }
         cfg.http["full-address"] = httpfa;
@@ -233,7 +233,7 @@ function preprocessConfig(cfg) {
 
     if (!cfg.https["full-address"]) {
         var httpsfa = cfg.https.domain;
-        if (cfg.https.port !== 443) {
+        if (cfg.https["default-port"] !== 443) {
             httpsfa += ":" + cfg.https["default-port"];
         }
         cfg.https["full-address"] = httpsfa;
diff --git a/lib/web/acp.js b/lib/web/acp.js
index b2644b8b..b9dbea9e 100644
--- a/lib/web/acp.js
+++ b/lib/web/acp.js
@@ -43,9 +43,9 @@ function checkAdmin(cb) {
 function handleAcp(req, res, user) {
     var sio;
     if (req.secure) {
-        sio = Config.get("https.domain") + ":" + Config.get("https.port");
+        sio = Config.get("https.domain") + ":" + Config.get("https.default-port");
     } else {
-        sio = Config.get("io.domain") + ":" + Config.get("io.port");
+        sio = Config.get("io.domain") + ":" + Config.get("io.default-port");
     }
     sio += "/socket.io/socket.io.js";