1 files changed, 3 insertions, 3 deletions
diff --git a/lib/ip.c b/lib/ip.c
index 2050d19e..5e039c12 100644
--- a/lib/ip.c
+++ b/lib/ip.c
@@ -58,7 +58,7 @@ ip6_mkmask(uint n)
   return a;
 }
 
-int
+uint
 ip6_masklen(ip6_addr *a)
 {
   int i, j, n;
@@ -67,12 +67,12 @@ ip6_masklen(ip6_addr *a)
     if (a->addr[i] != ~0U)
     {
       j = u32_masklen(a->addr[i]);
-      if (j < 0)
+      if (j == 255)
 	return j;
       n += j;
       while (++i < 4)
 	if (a->addr[i])
-	  return -1;
+	  return 255;
       break;
     }