diff --git a/src/mami.js/main.js b/src/mami.js/main.js
index 5457ca2..d383510 100644
--- a/src/mami.js/main.js
+++ b/src/mami.js/main.js
@@ -584,7 +584,7 @@ window.Umi = { UI: {}, Protocol: { SockChat: { Protocol: {} } } };
         'joinfail': 'You are banned.',
     };
 
-    const sockChat = new Umi.Protocol.SockChat.Protocol;
+    const sockChat = new Umi.Protocol.SockChat.Protocol(futami.get('ping') * 1000);
     MamiCompat('Umi.Server', { get: () => sockChat, configurable: true });
 
     let dumpEvents = false;
diff --git a/src/mami.js/sockchat_old.js b/src/mami.js/sockchat_old.js
index 092a3bb..15982cb 100644
--- a/src/mami.js/sockchat_old.js
+++ b/src/mami.js/sockchat_old.js
@@ -1,9 +1,11 @@
-#include common.js
 #include eventtarget.js
 #include servers.js
 #include websock.js
 
-Umi.Protocol.SockChat.Protocol = function() {
+Umi.Protocol.SockChat.Protocol = function(pingDuration) {
+    if(typeof pingDuration !== 'number')
+        throw 'pingDuration must be a number';
+
     const eventTarget = new MamiEventTarget('mami:proto');
 
     const parseUserColour = str => {
@@ -93,7 +95,7 @@ Umi.Protocol.SockChat.Protocol = function() {
         send('2', selfUserId, text);
     };
 
-    const startKeepAlive = () => sock?.sendInterval(`0\t${selfUserId}`, futami.get('ping') * 1000);
+    const startKeepAlive = () => sock?.sendInterval(`0\t${selfUserId}`, pingDuration);
     const stopKeepAlive = () => sock?.clearIntervals();
 
     const onOpen = ev => {