diff --git a/src/irc.c b/src/irc.c
--- a/src/irc.c
+++ b/src/irc.c
@@ -19,20 +19,11 @@
 
 #include <compat.h>
 #include <irc.h>
+#include "common.h"
 
-#define  NOTICE  0
-#define    MODE  1
-#define    JOIN  2
-#define    PART  3
-#define   TOPIC  4
-#define    PING  5
-#define  ENOMEM  6
-#define   ERROR  7
-#define VERSION  8
-#define PRIVMSG  9
-#define    QUIT 10
-#define    NICK 11
-#define    KICK 12
+enum {
+    NOTICE, MODE, JOIN, PART, TOPIC, PING, ENOMEM, ERROR, VERSION, PRIVMSG, QUIT, NICK, KICK
+};
 
 #define VERSION_STRING "MCBOT on GNU/LINUX"
 
@@ -96,7 +87,7 @@
 int irc_login (FILE * stream, char *server, char *nick, char *password)
 {
     MSG message = { NULL, 0, 0, 0, 0, 0, 0 };
-    char msg[513];
+    char msg[DEFAULT_BUF_SIZE];
     char *user;
     struct passwd *pwd;
 
@@ -118,8 +109,7 @@
         fprintf (stream, "PRIVMSG NICKSERV :IDENTIFY %s\r\n", password);
 
     for (;;) {
-        *msg = '\0';
-        fgets (msg, 512, stream);
+        fgets (msg, sizeof (msg), stream);
         if ((user = irc_parsemessage (msg, &message)) != NULL)
             printf ("%10s %s\n", user, message.line);
 
@@ -267,7 +257,7 @@
                         *ptr = '\0';
 
                     message->channel = strtok (message->line, " ");
-                    strncpy (message->current_channel, message->channel, 40);
+                    strncpy (message->current_channel, message->channel, sizeof (message->current_channel));
                     message->line = strtok (NULL, "\r\n");
                     message->line++;
                     printf ("%10s %s %s :%s\n", "READ", message->command, message->channel, message->line);