diff --git a/lam/lib/webauthn.inc b/lam/lib/webauthn.inc
index 0c79fd3a..ed3b63d9 100644
--- a/lam/lib/webauthn.inc
+++ b/lam/lib/webauthn.inc
@@ -281,7 +281,7 @@ class WebauthnManager {
 	 *
 	 * @return ExtensionOutputCheckerHandler handler
 	 */
-	function getExtensionOutputChecker() {
+	private function getExtensionOutputChecker() {
 		return new ExtensionOutputCheckerHandler();
 	}