diff --git a/classes/db/DB.class.php b/classes/db/DB.class.php
index d16299c1f..688cdf354 100644
--- a/classes/db/DB.class.php
+++ b/classes/db/DB.class.php
@@ -418,10 +418,10 @@
 
             switch($operation) {
                 case 'like_prefix' :
-                        $value = $value.'%';
+                        $value = '%'.$value;
                     break;
                 case 'like_tail' :
-                        $value = '%'.$value;
+                        $value = $value.'%';
                     break;
                 case 'like' :
                         $value = '%'.$value.'%';