diff --git a/auth/lti/classes/local/ltiadvantage/utility/cookie_helper.php b/auth/lti/classes/local/ltiadvantage/utility/cookie_helper.php
index 4a1d6189b48..e43695f9f14 100644
--- a/auth/lti/classes/local/ltiadvantage/utility/cookie_helper.php
+++ b/auth/lti/classes/local/ltiadvantage/utility/cookie_helper.php
@@ -276,9 +276,9 @@ final class cookie_helper {
             bool $casesensitive): bool {
 
         if ($casesensitive) {
-            return str_contains($headerstring, $attribute);
+            return strpos($headerstring, $attribute) !== false;
         }
-        return str_contains(strtolower($headerstring), strtolower($attribute));
+        return strpos(strtolower($headerstring), strtolower($attribute)) !== false;
     }
 
     /**