Index: kernel/classes/ezcontentlanguage.php
===================================================================
--- kernel/classes/ezcontentlanguage.php    (revision 1075)
+++ kernel/classes/ezcontentlanguage.php    (working copy)
@@ -31,8 +31,6 @@

 class eZContentLanguage extends eZPersistentObject
 {
-    const MAX_COUNT = 30;
-
     /**
      * Constructor.
      *
@@ -78,7 +76,7 @@
      * \param name Optional. Name of the language. If not specified, the international language name for the $locale locale
      *             will be used.
      * \return eZContentLanguage object of the added language (or the existing one if specified language has been already used)
-     *         or false in case of any error (invalid locale code or already reached eZContentLanguage::MAX_COUNT languages).
+     *         or false in case of any error (invalid locale code or already reached eZContentLanguage::maxCount() languages).
      * \static
      */
     static function addLanguage( $locale, $name = null )
@@ -105,7 +103,7 @@
             return $existingLanguage;
         }

-        if ( count( $languages ) >= eZContentLanguage::MAX_COUNT )
+        if ( count( $languages ) >= eZContentLanguage::maxCount() )
         {
             eZDebug::writeError( 'Too many languages, cannot add more!', 'eZContentLanguage::addLanguage' );
             return false;
@@ -881,6 +879,19 @@
                $GLOBALS['eZContentLanguageMask'],
                $GLOBALS['eZContentLanguageCronjobMode'] );
     }
+
+    /**
+     * The maximum number of languages supported.
+     * On 64-bit platforms we support more languages. PHP uses signed integers,
+     * so we can use 63 bits on 64 bits hardware, or 31 on 32-bit. The database
+     * uses a 64-bit integer on all platforms.
+     *
+     * \static
+     */
+    static function maxCount()
+    {
+        return PHP_INT_SIZE == 8 ? 63 : 31;
+    }
 }

 ?>
Index: extension/ezurlaliasmigration/classes/ezpurlaliasquerystrict.php
===================================================================
--- extension/ezurlaliasmigration/classes/ezpurlaliasquerystrict.php    (revision 1075)
+++ extension/ezurlaliasmigration/classes/ezpurlaliasquerystrict.php    (working copy)
@@ -80,7 +80,7 @@

         $list = array();

-        $maxNumberOfLanguges = eZContentLanguage::MAX_COUNT;
+        $maxNumberOfLanguges = eZContentLanguage::maxCount();
         $maxInteger = pow( 2, $maxNumberOfLanguges );
         $defaultLanguage = eZContentLanguage::topPriorityLanguage();

Index: kernel/classes/ezurlaliasquery.php
===================================================================
--- kernel/classes/ezurlaliasquery.php  (revision 1075)
+++ kernel/classes/ezurlaliasquery.php  (working copy)
@@ -338,11 +338,12 @@
         if ( !is_array( $rows ) || count( $rows ) == 0 )
             return array();
         $list = array();
+        $maxNumberOfLanguges = eZContentLanguage::maxCount();
         foreach ( $rows as $row )
         {
             $row['always_available'] = $row['lang_mask'] % 2;
             $mask = $row['lang_mask'] & ~1;
-            for ( $i = 1; $i < 30; ++$i )
+            for ( $i = 1; $i < $maxNumberOfLanguges; ++$i )
             {
                 $newMask = (1 << $i);
                 if ( ($newMask & $mask) > 0 )