diff --git a/lib/Alchemy/Phrasea/Controller/Thesaurus/ThesaurusXmlHttpController.php b/lib/Alchemy/Phrasea/Controller/Thesaurus/ThesaurusXmlHttpController.php
index b5a2ff441e..ca820a6be5 100644
--- a/lib/Alchemy/Phrasea/Controller/Thesaurus/ThesaurusXmlHttpController.php
+++ b/lib/Alchemy/Phrasea/Controller/Thesaurus/ThesaurusXmlHttpController.php
@@ -1426,12 +1426,7 @@ class ThesaurusXmlHttpController extends Controller
 
     public function searchTermJson(Request $request)
     {
-        if (null === $lng = $request->get('lng')) {
-            $data = explode('_', $this->app['locale']);
-            if (count($data) > 0) {
-                $lng = $data[0];
-            }
-        }
+        $lng = $request->get('lng');
 
         $html = '';
         $sbid = (int) $request->get('sbid');
@@ -1485,7 +1480,10 @@ class ThesaurusXmlHttpController extends Controller
                         $q2 .= ' and starts-with(@k, \'' . \thesaurus::xquery_escape($unicode->remove_indexer_chars($t[1])) . '\')';
                     }
 
-					$q2 .= ' and @lng=\'' . \thesaurus::xquery_escape($lng) . '\'';
+                    if($lng != null){
+                        $q2 .= ' and @lng=\'' . \thesaurus::xquery_escape($lng) . '\'';
+                    }
+
                     $q .= ('//sy[' . $q2 . ']');
 
                     $nodes = $xpath->query($q);