diff --git a/src/NodaTimeAutotranslater.php b/src/NodaTimeAutotranslater.php
index 4172159..128a7bf 100644
--- a/src/NodaTimeAutotranslater.php
+++ b/src/NodaTimeAutotranslater.php
@@ -706,7 +706,7 @@ final class NodaTimeAutotranslater {
         $this->_mysqli_noda = $mysqli_noda;
         $this->_znum = $znum;
 
-        $this->_insertStmt = $mysqli_noda->do_prepare("INSERT INTO `zeit_translation`
+        $this->_insertStmt = $this->_mysqli_noda->do_prepare("INSERT INTO `zeit_translation`
             (`zeit_id`, `trans_language`, `trans_name`)
             VALUES
             (?, ?, ?)");