diff --git a/lib/languages.php b/lib/languages.php
index 16ff825de17..4fa0f44518e 100644
--- a/lib/languages.php
+++ b/lib/languages.php
@@ -23,7 +23,7 @@ $LANGUAGES = array (
 "ce" => "Chechen",
 "ch" => "Chamorro",
 "co" => "Corsican",
-"cz" => "Czech",
+"cs" => "Czech",
 "cu" => "Church Slavic",
 "cv" => "Chuvash",
 "cy" => "Welsh",