diff --git a/interface.h b/interface.h
index 24c1ec8749ca7d42e9eb8ce3a262fa2a9fd17563..2b70a2832cda78d7b783402678dcfe8b95c1f1fd 100644
--- a/interface.h
+++ b/interface.h
@@ -84,7 +84,7 @@ struct interface_conf {
 
 struct buffered {
     struct sockaddr_in6 sin6;
-    char *buf;
+    unsigned char *buf;
     int len;
     int size;
     int flush_interval;
diff --git a/neighbour.c b/neighbour.c
index 260576b1197b89d8c947088f953e1a12978b5f1b..4e9bc4eb4d3c1e5b3138effeff8aef004f7f3188 100644
--- a/neighbour.c
+++ b/neighbour.c
@@ -77,7 +77,7 @@ find_neighbour(const unsigned char *address, struct interface *ifp)
 {
     struct neighbour *neigh;
     const struct timeval zero = {0, 0};
-    char *buf;
+    unsigned char *buf;
 
     neigh = find_neighbour_nocreate(address, ifp);
     if(neigh)