diff --git a/pkg/abi/linux/netfilter.go b/pkg/abi/linux/netfilter.go
index 0ac5d67df..d5ddf1199 100644
--- a/pkg/abi/linux/netfilter.go
+++ b/pkg/abi/linux/netfilter.go
@@ -33,6 +33,18 @@ const (
 	NF_INET_NUMHOOKS     = 5
 )
 
+// Protocol families (address families). These correspond to values in
+// include/uapi/linux/netfilter.h.
+const (
+	NFPROTO_UNSPEC = 0
+	NFPROTO_INET   = 1
+	NFPROTO_IPV4   = 2
+	NFPROTO_ARP    = 3
+	NFPROTO_NETDEV = 5
+	NFPROTO_BRIDGE = 7
+	NFPROTO_IPV6   = 10
+)
+
 // Verdicts that can be returned by targets. These correspond to values in
 // include/uapi/linux/netfilter.h
 const (