diff --git a/src/other.c b/src/other.c
index f9df885..21a19f4 100644
--- a/src/other.c
+++ b/src/other.c
@@ -298,7 +298,7 @@ const char *ntop_ipaddr_init(const union ipaddr_t *ip __attribute__ ((unused)))
 
 const char *ntop_ipaddr_v4(const union ipaddr_t *ip)
 {
-	static char buffer[sizeof("255.255.255.255")];
+	static char buffer[INET_ADDRSTRLEN];
 	struct in_addr addr;
 
 	addr.s_addr = htonl(ip->v4);
@@ -307,7 +307,7 @@ const char *ntop_ipaddr_v4(const union ipaddr_t *ip)
 
 const char *ntop_ipaddr_v6(const union ipaddr_t *ip)
 {
-	static char buffer[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
+	static char buffer[INET6_ADDRSTRLEN];
 	struct in6_addr addr;
 
 	memcpy(addr.s6_addr, ip->v6, sizeof(addr.s6_addr));