diff --git a/lib/liblwip.a b/lib/liblwip.a
index 7cf217b0..ab4f4698 100644
Binary files a/lib/liblwip.a and b/lib/liblwip.a differ
diff --git a/third_party/lwip/core/ipv6/mld6.c b/third_party/lwip/core/ipv6/mld6.c
index 86f07edc..8c2f4b6a 100644
--- a/third_party/lwip/core/ipv6/mld6.c
+++ b/third_party/lwip/core/ipv6/mld6.c
@@ -499,7 +499,10 @@ mld6_delayed_report(struct mld_group *group, u16_t maxresp)
 
 #ifdef LWIP_RAND
   /* Randomize maxresp. (if LWIP_RAND is supported) */
-  maxresp = (LWIP_RAND() % (maxresp - 1)) + 1;
+  maxresp = LWIP_RAND() % maxresp;
+  if (maxresp == 0) {
+    maxresp = 1;
+  }
 #endif /* LWIP_RAND */
 
   /* Apply timer value if no report has been scheduled already. */