diff --git a/src/node/handler/PadMessageHandler.js b/src/node/handler/PadMessageHandler.js
index 7cd945af..eaf24b7a 100644
--- a/src/node/handler/PadMessageHandler.js
+++ b/src/node/handler/PadMessageHandler.js
@@ -1429,7 +1429,7 @@ function composePadChangesets(padId, startNum, endNum, callback)
  */
 exports.padUsersCount = function (padID, callback) {
   callback(null, {
-    padUsersCount: socketio.sockets.clients(padId).length
+    padUsersCount: socketio.sockets.clients(padID).length
   });
 }