diff -r dd7183cf0a71 -r 8e6d91e4dd8f libpurple/protocols/bonjour/xmpp.c
--- a/libpurple/protocols/bonjour/xmpp.c	Wed Oct 30 22:19:59 2019 -0400
+++ b/libpurple/protocols/bonjour/xmpp.c	Wed Oct 30 23:25:39 2019 -0400
@@ -1467,6 +1467,5 @@
 	    !IN6_IS_ADDR_LINKLOCAL(&in6_addr))
 		return;
 
-	snprintf(ip + strlen(ip), len_remain, "%%%d",
-		 interface_param);
+	g_snprintf(ip + strlen(ip), len_remain, "%%%d", interface_param);
 }