diff --git a/auth/cas/db/upgrade.php b/auth/cas/db/upgrade.php
index 9f9539ef40f..b82fcc2f347 100644
--- a/auth/cas/db/upgrade.php
+++ b/auth/cas/db/upgrade.php
@@ -37,10 +37,11 @@ function xmldb_auth_cas_upgrade($oldversion) {
             set_config('start_tls', 0, 'auth/cas');
         }
         upgrade_plugin_savepoint(true, 2013052100, 'auth', 'cas');
+    }
 
     if ($oldversion < 2013091700) {
         // The value of the phpCAS language constants has changed from
-        // 'langname' to 'CAS_Languages_langname'.
+        // 'langname' to 'CAS_Languages_Langname'.
         if ($cas_language = get_config('auth/cas', 'language')) {
             set_config('language', 'CAS_Languages_'.ucfirst($cas_language), 'auth/cas');
         }
diff --git a/auth/cas/languages.php b/auth/cas/languages.php
index e404b88d9cf..d1de0a72cd4 100644
--- a/auth/cas/languages.php
+++ b/auth/cas/languages.php
@@ -1,7 +1,7 @@
 <?php
 
 $caslangconstprefix = 'PHPCAS_LANG_';
-$caslangprefixlen = strlen('CAS_Language_') + 1;
+$caslangprefixlen = strlen('CAS_Languages_');
 $CASLANGUAGES = array ();
 
 $consts = get_defined_constants(true);
diff --git a/auth/cas/version.php b/auth/cas/version.php
index 31559583069..84469a0229a 100644
--- a/auth/cas/version.php
+++ b/auth/cas/version.php
@@ -26,7 +26,7 @@
 
 defined('MOODLE_INTERNAL') || die();
 
-$plugin->version   = 2013052100;        // The current plugin version (Date: YYYYMMDDXX)
+$plugin->version   = 2013091700;        // The current plugin version (Date: YYYYMMDDXX)
 $plugin->requires  = 2013050100;        // Requires this Moodle version
 $plugin->component = 'auth_cas';        // Full name of the plugin (used for diagnostics)