diff --git a/include/proto/protocol.h b/include/proto/protocol.h
index 13a3c0a..857f9e6 100644
--- a/include/proto/protocol.h
+++ b/include/proto/protocol.h
@@ -25,7 +25,7 @@
 #include <sys/socket.h>
 #include <types/protocol.h>
 
-extern struct protocol *__protocol_by_family[AF_MAX];
+extern struct protocol *__protocol_by_family[AF_CUST_MAX];
 
 /* Registers the protocol <proto> */
 void protocol_register(struct protocol *proto);
@@ -56,7 +56,7 @@
 /* returns the protocol associated to family <family> or NULL if not found */
 static inline struct protocol *protocol_by_family(int family)
 {
-	if (family >= 0 && family < AF_MAX)
+	if (family >= 0 && family < AF_CUST_MAX)
 		return __protocol_by_family[family];
 	return NULL;
 }
diff --git a/include/types/protocol.h b/include/types/protocol.h
index 9480c18..378e2b0 100644
--- a/include/types/protocol.h
+++ b/include/types/protocol.h
@@ -33,6 +33,23 @@
 struct listener;
 struct connection;
 
+/*
+ * Custom network family for str2sa parsing.  Should be ok to do this since
+ * sa_family_t is standardized as an unsigned integer
+ */
+
+#define AF_CUST_SOCKPAIR     (AF_MAX + 1)
+#define AF_CUST_MAX          (AF_MAX + 2)
+
+/*
+ * Test in case AF_CUST_MAX overflows the sa_family_t (unsigned int)
+ */
+#if (AF_CUST_MAX < AF_MAX)
+# error "Can't build on the target system, AF_CUST_MAX overflow"
+#endif
+
+
+
 /* max length of a protcol name, including trailing zero */
 #define PROTO_NAME_LEN 16