diff --git a/lib-php/tokenizer/legacy_icu_tokenizer.php b/lib-php/tokenizer/legacy_icu_tokenizer.php
index 7a900e5a..ef79769c 100644
--- a/lib-php/tokenizer/legacy_icu_tokenizer.php
+++ b/lib-php/tokenizer/legacy_icu_tokenizer.php
@@ -19,7 +19,7 @@ class Tokenizer
 
     public function checkStatus()
     {
-        $sSQL = "SELECT word_id FROM word limit 1";
+        $sSQL = 'SELECT word_id FROM word limit 1';
         $iWordID = $this->oDB->getOne($sSQL);
         if ($iWordID === false) {
             throw new Exception('Query failed', 703);