diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c
index e7730a5175c..1ecfb77de27 100644
--- a/src/shared/dns-domain.c
+++ b/src/shared/dns-domain.c
@@ -503,7 +503,7 @@ int dns_name_compare_func(const void *a, const void *b) {
                 r = dns_label_unescape_suffix(a, &x, la, sizeof(la));
                 q = dns_label_unescape_suffix(b, &y, lb, sizeof(lb));
                 if (r < 0 || q < 0)
-                        return r - q;
+                        return CMP(r, q);
 
                 r = ascii_strcasecmp_nn(la, r, lb, q);
                 if (r != 0)