diff --git a/lib/Db/Item.php b/lib/Db/Item.php
index 0ed9e91135..51f3731861 100644
--- a/lib/Db/Item.php
+++ b/lib/Db/Item.php
@@ -189,9 +189,8 @@ public function generateSearchIndex(): void
         }
 
         $search_string .= $this->getUrl();
-        $search_string .= 'UTF-8';
 
-        $this->setSearchIndex(mb_strtolower($search_string));
+        $this->setSearchIndex(mb_strtolower($search_string,'UTF-8'));
         $this->setFingerprint($this->computeFingerprint());
         $this->setContentHash($this->computeContentHash());
     }