diff -up mail-notification-5.4/build/src/mn-pop3-mailbox.c mail-notification-5.4-OK/build/src/mn-pop3-mailbox.c
--- mail-notification-5.4/build/src/mn-pop3-mailbox.c	2009-05-19 10:29:58.448201837 +0200
+++ mail-notification-5.4-OK/build/src/mn-pop3-mailbox.c	2009-05-19 10:23:29.356204287 +0200
@@ -619,7 +619,7 @@ mn_pop3_mailbox_enter_auth_cb (MNClientS
 
 	if (initial_clientoutlen > 0)
 	  {
-	    char buf64[initial_clientoutlen * 2]; /* Base64 is 33% larger than the data it encodes */
+	    char buf64[initial_clientoutlen * 2 + 1]; /* Base64 is 33% larger than the data it encodes */
 	    unsigned int outlen;
 	    int result;
 	    char *str;
diff -up mail-notification-5.4/src/mn-client-session.c mail-notification-5.4-OK/src/mn-client-session.c
--- mail-notification-5.4/src/mn-client-session.c	2008-05-22 17:45:35.000000000 +0200
+++ mail-notification-5.4-OK/src/mn-client-session.c	2009-05-19 10:29:09.112211055 +0200
@@ -1030,7 +1030,7 @@ mn_client_session_write (MNClientSession
 static int
 write_base64 (MNClientSession *session, const char *buf, unsigned int len)
 {
-  char buf64[len * 2];		/* Base64 is 33% larger than the data it encodes */
+  char buf64[len * 2 + 1];		/* Base64 is 33% larger than the data it encodes */
   unsigned int outlen;
   int result;
   char *str;