diff --git a/basis/unix/ffi/bsd/bsd.factor b/basis/unix/ffi/bsd/bsd.factor
index 43e2d4e215..388fd5a692 100644
--- a/basis/unix/ffi/bsd/bsd.factor
+++ b/basis/unix/ffi/bsd/bsd.factor
@@ -73,7 +73,6 @@ CONSTANT: AF_INET 2
 ALIAS: PF_UNSPEC AF_UNSPEC
 ALIAS: PF_UNIX AF_UNIX
 ALIAS: PF_INET AF_INET
-ALIAS: PF_INET6 AF_INET6
 
 CONSTANT: IPPROTO_TCP 6
 CONSTANT: IPPROTO_UDP 17
diff --git a/basis/unix/ffi/bsd/freebsd/freebsd.factor b/basis/unix/ffi/bsd/freebsd/freebsd.factor
index 04e03e0f81..cb45cf2b20 100644
--- a/basis/unix/ffi/bsd/freebsd/freebsd.factor
+++ b/basis/unix/ffi/bsd/freebsd/freebsd.factor
@@ -2,6 +2,7 @@ USING: alien.c-types alien.syntax classes.struct unix.types ;
 IN: unix.ffi
 
 CONSTANT: AF_INET6 28
+ALIAS: PF_INET6 AF_INET6
 
 CONSTANT: FD_SETSIZE 1024
 
diff --git a/basis/unix/ffi/bsd/openbsd/openbsd.factor b/basis/unix/ffi/bsd/openbsd/openbsd.factor
index 0a590ae27e..dba7ddd3cd 100644
--- a/basis/unix/ffi/bsd/openbsd/openbsd.factor
+++ b/basis/unix/ffi/bsd/openbsd/openbsd.factor
@@ -2,6 +2,7 @@ USING: alien.c-types alien.syntax classes.struct unix.types ;
 IN: unix.ffi
 
 CONSTANT: AF_INET6 24
+ALIAS: PF_INET6 AF_INET6
 
 CONSTANT: FD_SETSIZE 1024