Spelling fixes.
diff --git a/src/radv.c b/src/radv.c
index 96eac93..4f31457 100644
--- a/src/radv.c
+++ b/src/radv.c
@@ -407,7 +407,7 @@
   if (ra_param)
     mtu = ra_param->mtu;
 #ifdef HAVE_LINUX_NETWORK
-  /* Note that IPv6 MTU is not neccessarily the same as the IPv4 MTU
+  /* Note that IPv6 MTU is not necessarily the same as the IPv4 MTU
      available from SIOCGIFMTU */
   if (mtu == 0)
     {