diff --git a/gulliver/system/class.dbMaintenance.php b/gulliver/system/class.dbMaintenance.php
index c0f1ece02..2954506d7 100755
--- a/gulliver/system/class.dbMaintenance.php
+++ b/gulliver/system/class.dbMaintenance.php
@@ -451,9 +451,8 @@ class DataBaseMaintenance
         }
             
         $sQuery = 'LOCK TABLES ' . implode( ' READ, ', $aTables ) . ' READ; ';
-        $sQuery = $filter->preventSqlInjection($sQuery);
         
-        if (@mysql_query( $sQuery )) {
+        if (@mysql_query( $filter->preventSqlInjection($sQuery) )) {
             echo "    [OK]\n";
             return true;
         } else {