diff --git a/src/etc/inc/certs.inc b/src/etc/inc/certs.inc
index 827e03202..5465c755e 100644
--- a/src/etc/inc/certs.inc
+++ b/src/etc/inc/certs.inc
@@ -663,7 +663,7 @@ function is_openvpn_server_crl($crlref)
 
 function is_crl_internal($crl)
 {
-    return $crl["crlmethod"] ?? '' == "internal";
+    return ($crl["crlmethod"] ?? '') == "internal";
 }
 
 function cert_get_cn($crt, $isref = false)