diff --git a/src/chat-messages.js b/src/chat-messages.js
index 6dc925e..9fa51a2 100644
--- a/src/chat-messages.js
+++ b/src/chat-messages.js
@@ -18,7 +18,7 @@ function lowestNumberInListing(items) {
   const sortedNumbers = Object.keys(items)
                               .map(i => parseInt(i))
                               .filter(i => !Number.isNaN(i))
-                              .sort(function(a, b) { return a - b });
+                              .sort();
   return sortedNumbers[0];
 }