diff --git a/bgpd/bgp_aspath.c b/bgpd/bgp_aspath.c
index 191a9e7..0aec3ef 100644
--- a/bgpd/bgp_aspath.c
+++ b/bgpd/bgp_aspath.c
@@ -1378,7 +1378,7 @@
 aspath_add_asns (struct aspath *aspath, as_t asno, u_char type, unsigned num)
 {
   struct assegment *assegment = aspath->segments;
-  int i;
+  unsigned i;
 
   if (assegment && assegment->type == type)
     {
diff --git a/isisd/isis_bpf.c b/isisd/isis_bpf.c
index 4d5b165..f6176ef 100644
--- a/isisd/isis_bpf.c
+++ b/isisd/isis_bpf.c
@@ -301,13 +301,14 @@
 isis_send_pdu_bcast (struct isis_circuit *circuit, int level)
 {
   struct ether_header *eth;
-  int written, buflen;
+  ssize_t written;
+  size_t buflen;
 
   buflen = stream_get_endp (circuit->snd_stream) + LLC_LEN + ETHER_HDR_LEN;
   if (buflen > sizeof (sock_buff))
     {
-      zlog_warn ("isis_send_pdu_bcast: sock_buff size %lu is less than "
-		 "output pdu size %d on circuit %s",
+      zlog_warn ("isis_send_pdu_bcast: sock_buff size %zu is less than "
+		 "output pdu size %zu on circuit %s",
 		 sizeof (sock_buff), buflen, circuit->interface->name);
       return ISIS_WARNING;
     }
diff --git a/isisd/isis_lsp.c b/isisd/isis_lsp.c
index f2a7923..83dc604 100644
--- a/isisd/isis_lsp.c
+++ b/isisd/isis_lsp.c
@@ -379,7 +379,7 @@
   /* Compute autentication value */
   hmac_md5 (STREAM_DATA (lsp->pdu), stream_get_endp(lsp->pdu),
             (unsigned char *) &passwd->passwd, passwd->len,
-            (caddr_t) &hmac_md5_hash);
+            (unsigned char *) &hmac_md5_hash);
   /* Copy the hash into the stream */
   memcpy (STREAM_DATA (lsp->pdu) + lsp->auth_tlv_offset + 3,
           hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
diff --git a/isisd/isis_pdu.c b/isisd/isis_pdu.c
index 166dd7c..557dc01 100644
--- a/isisd/isis_pdu.c
+++ b/isisd/isis_pdu.c
@@ -204,7 +204,7 @@
       /* Compute the digest */
       hmac_md5 (STREAM_DATA (stream), stream_get_endp (stream),
                 (unsigned char *) &(local->passwd), local->len,
-                (caddr_t) &digest);
+                (unsigned char *) &digest);
       /* Copy back the authentication value after the check */
       memcpy (STREAM_DATA (stream) + auth_tlv_offset + 3,
               remote->passwd, ISIS_AUTH_MD5_SIZE);
@@ -2469,7 +2469,7 @@
       hmac_md5 (STREAM_DATA (circuit->snd_stream),
                 stream_get_endp (circuit->snd_stream),
                 (unsigned char *) &circuit->passwd.passwd, circuit->passwd.len,
-                (caddr_t) &hmac_md5_hash);
+                (unsigned char *) &hmac_md5_hash);
       /* Copy the hash into the stream */
       memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
               hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
@@ -2656,7 +2656,7 @@
       hmac_md5 (STREAM_DATA (circuit->snd_stream),
                 stream_get_endp(circuit->snd_stream),
                 (unsigned char *) &passwd->passwd, passwd->len,
-                (caddr_t) &hmac_md5_hash);
+                (unsigned char *) &hmac_md5_hash);
       /* Copy the hash into the stream */
       memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
               hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
@@ -2992,7 +2992,7 @@
       hmac_md5 (STREAM_DATA (circuit->snd_stream),
                 stream_get_endp(circuit->snd_stream),
                 (unsigned char *) &passwd->passwd, passwd->len,
-                (caddr_t) &hmac_md5_hash);
+                (unsigned char *) &hmac_md5_hash);
       /* Copy the hash into the stream */
       memcpy (STREAM_DATA (circuit->snd_stream) + auth_tlv_offset + 3,
               hmac_md5_hash, ISIS_AUTH_MD5_SIZE);
diff --git a/isisd/isis_pfpacket.c b/isisd/isis_pfpacket.c
index 4bc8717..463f559 100644
--- a/isisd/isis_pfpacket.c
+++ b/isisd/isis_pfpacket.c
@@ -54,8 +54,8 @@
 u_char ALL_ISS[6] = { 0x09, 0x00, 0x2B, 0x00, 0x00, 0x05 };
 u_char ALL_ESS[6] = { 0x09, 0x00, 0x2B, 0x00, 0x00, 0x04 };
 
-static char discard_buff[8192];
-static char sock_buff[8192];
+static uint8_t discard_buff[8192];
+static uint8_t sock_buff[8192];
 
 /*
  * if level is 0 we are joining p2p multicast