diff --git a/mod/scorm/locallib.php b/mod/scorm/locallib.php
index 17c662e42c4..7e0e4f9eb50 100644
--- a/mod/scorm/locallib.php
+++ b/mod/scorm/locallib.php
@@ -812,8 +812,9 @@ function scorm_get_last_completed_attempt($scormid, $userid) {
     $sql = "SELECT MAX(attempt)
               FROM {scorm_scoes_track}
              WHERE userid = ? AND scormid = ?
-               AND (value='completed' OR value='passed')";
-    $lastattempt = $DB->get_field_sql($sql, array($userid, $scormid));
+               AND (".$DB->sql_compare_text('value')." = ".$DB->sql_compare_text('?')." OR ".
+                      $DB->sql_compare_text('value')." = ".$DB->sql_compare_text('?').")";
+    $lastattempt = $DB->get_field_sql($sql, array($userid, $scormid, 'completed', 'passed'));
     if (empty($lastattempt)) {
         return '1';
     } else {