diff --git a/js/client-chat-tournament.js b/js/client-chat-tournament.js
index 8f869ecf8..56eb2dc79 100644
--- a/js/client-chat-tournament.js
+++ b/js/client-chat-tournament.js
@@ -210,7 +210,7 @@
 
 			var teamIndex = undefined;
 			if (!forceFormatChange && this.$teamSelect.children().val()) {
-				teamIndex = parseInt(this.$teamSelect.children().val());
+				teamIndex = parseInt(this.$teamSelect.children().val(), 10);
 				if (isNaN(teamIndex)) teamIndex = undefined;
 			}