diff --git a/src/include/lwip/ip6_zone.h b/src/include/lwip/ip6_zone.h
index 41a9c909..7689dc1e 100644
--- a/src/include/lwip/ip6_zone.h
+++ b/src/include/lwip/ip6_zone.h
@@ -157,9 +157,9 @@
  * @return 1 if the address has a constrained scope, 0 if it does not.
  */
 #define ip6_addr_has_scope(ip6addr, type) \
-  (ip6_addr_islinklocal(ip6addr) || ((((type) != IP6_UNICAST) && \
-   ip6_addr_ismulticast_iflocal(ip6addr)) || \
-   ip6_addr_ismulticast_linklocal(ip6addr)))
+  (ip6_addr_islinklocal(ip6addr) || (((type) != IP6_UNICAST) && \
+   (ip6_addr_ismulticast_iflocal(ip6addr) || \
+    ip6_addr_ismulticast_linklocal(ip6addr))))
 
 /**
  * Assign a zone index to an IPv6 address, based on a network interface. If the