diff --git a/contrib/ipfilter/ipt.c b/contrib/ipfilter/ipt.c
index 48f35cf89e6f..d33a38d00f03 100644
--- a/contrib/ipfilter/ipt.c
+++ b/contrib/ipfilter/ipt.c
@@ -443,7 +443,8 @@ char *getifname(ptr)
 void *ptr;
 {
 #if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || \
+    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
 #else
 	char buf[32], *s;
 	int len;
@@ -458,7 +459,8 @@ void *ptr;
 	if (kmemcpy((char *)&netif, (u_long)ptr, sizeof(netif)) == -1)
 		return "X";
 #if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || \
+    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
 	return strdup(netif.if_xname);
 #else
 	if (kmemcpy(buf, (u_long)netif.if_name, sizeof(buf)) == -1)
diff --git a/contrib/ipfilter/kmem.c b/contrib/ipfilter/kmem.c
index 17622cdb79cc..470d2574eea2 100644
--- a/contrib/ipfilter/kmem.c
+++ b/contrib/ipfilter/kmem.c
@@ -204,7 +204,8 @@ void *ptr;
 	return ifname;
 #else
 # if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || \
+    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
 #else
 	char buf[32];
 	int len;
@@ -219,7 +220,8 @@ void *ptr;
 	if (kmemcpy((char *)&netif, (u_long)ptr, sizeof(netif)) == -1)
 		return "X";
 # if defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011) || \
-    defined(__OpenBSD__)
+    defined(__OpenBSD__) || \
+    (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
 	return strdup(netif.if_xname);
 # else
 	if (kstrncpy(buf, (u_long)netif.if_name, sizeof(buf)) == -1)