diff -r 31c7f587968d -r e9b59dd16117 libpurple/protocols/irc/parse.c
--- a/libpurple/protocols/irc/parse.c	Thu Aug 22 00:33:01 2013 +0530
+++ b/libpurple/protocols/irc/parse.c	Thu Aug 22 01:36:58 2013 +0530
@@ -384,7 +384,7 @@
 	do {
 		end = strpbrk(cur, "\002\003\007\017\026\037");
 
-		decoded = g_string_append_len(decoded, cur, end ? end - cur : strlen(cur));
+		decoded = g_string_append_len(decoded, cur, (end ? (goffset)(end - cur) : strlen(cur)));
 		cur = end ? end : cur + strlen(cur);
 
 		switch (*cur) {