diff --git a/htdocs/core/class/translate.class.php b/htdocs/core/class/translate.class.php
index 06d8432f3e1..150a92f5faf 100644
--- a/htdocs/core/class/translate.class.php
+++ b/htdocs/core/class/translate.class.php
@@ -469,7 +469,7 @@ class Translate
 		if (! $found && ! empty($conf->global->MAIN_ENABLE_OVERWRITE_TRANSLATION))
 		{
     		// Overwrite translation with database read
-            $sql ="SELECT transkey, transvalue FROM ".MAIN_DB_PREFIX."overwrite_trans where lang='".$db->escape($this->defaultlang)."' OR lang IS NULL";
+            $sql ="SELECT transkey, transvalue FROM ".MAIN_DB_PREFIX."overwrite_trans where (lang='".$db->escape($this->defaultlang)."' OR lang IS NULL)";
             $sql.=" AND entity IN (0, ".getEntity('overwrite_trans').")";
             $sql.=$db->order("lang", "DESC");
 		    $resql=$db->query($sql);