--- a/src/arpd/io.c
+++ b/src/arpd/io.c
@@ -615,7 +615,7 @@ int ip_itf_info(int number,uint32_t *ip,
 int get_local(int fd,struct sockaddr_atmsvc *addr)
 {
     int result;
-    size_t length;
+    socklen_t length;
 
     length = sizeof(struct sockaddr_atmsvc);
     result = getsockname(fd,(struct sockaddr *) addr,&length);
--- a/src/led/conn.c
+++ b/src/led/conn.c
@@ -405,7 +405,7 @@ Conn_t *accept_conn(Conn_t *conn)
 {
         Conn_t *new;
         struct sockaddr_atmsvc addr;
-        size_t len;
+        socklen_t len;
         int fd;
         char buff[MAX_ATM_ADDR_LEN+1];
 
@@ -538,7 +538,7 @@ static int handle_accept(Conn_t *conn)
  */
 static int handle_data(Conn_t *conn)
 {
-        char buff[MAX_CTRL_FRAME];
+        unsigned char buff[MAX_CTRL_FRAME];
         int retval;
 
         retval = recv_frame(conn, buff, sizeof(buff));
--- a/src/led/frames.c
+++ b/src/led/frames.c
@@ -312,7 +312,7 @@ static void handle_ready_ind(Conn_t *con
  * dependant handler functions.
  * Returns < 0 for serious error
  */
-int handle_frame(Conn_t *conn, char *buff, int size)
+int handle_frame(Conn_t *conn, unsigned char *buff, int size)
 {
         struct ctrl_frame *frame;
 
--- a/src/led/frames.h
+++ b/src/led/frames.h
@@ -13,7 +13,7 @@ int validate_frame(unsigned char *buff,
 void send_ready_ind(Conn_t *conn);
 void send_register_req(void);
 
-int handle_frame(Conn_t *conn, char *buff, int size);
+int handle_frame(Conn_t *conn, unsigned char *buff, int size);
 uint32_t send_flush_req(Conn_t *conn);
 
 void parse_tlvs(uint16_t opcode, unsigned char *tlvp, int numtlvs, int sizeoftlvs);
--- a/src/led/join.c
+++ b/src/led/join.c
@@ -43,7 +43,7 @@ static int read_join_rsp(char *buff, int
 static int parse_join_rsp(unsigned char *buff, int size);
 
 static int get_bus_addr(struct sockaddr_atmsvc *addr);
-static int read_bus_arp(Conn_t *conn, struct sockaddr_atmsvc *addr, char *buff, int buffsize);
+static int read_bus_arp(Conn_t *conn, struct sockaddr_atmsvc *addr, unsigned char *buff, int buffsize);
 
 /*
  * 5.1, Initial state
@@ -693,7 +693,7 @@ static int get_bus_addr(struct sockaddr_
         fd_set rfds;
         struct timeval tv;
         int n = 0, retval, timeout;
-        char buff[MAX_CTRL_FRAME];
+        unsigned char buff[MAX_CTRL_FRAME];
 
         timeout = 4; /* wait response for 4 seconds */
         lec_params.c7c_current_timeout = 1;
@@ -740,7 +740,7 @@ static int get_bus_addr(struct sockaddr_
  * Tries to read BUS ATM address in *addr
  * returns < 0 for error, 0 for not found > 0 for success
  */
-static int read_bus_arp(Conn_t *conn, struct sockaddr_atmsvc *addr, char *buff, int buffsize)
+static int read_bus_arp(Conn_t *conn, struct sockaddr_atmsvc *addr, unsigned char *buff, int buffsize)
 {
         int frame_size;
         struct ctrl_frame *frame;