diff --git a/extra/unix/unix.factor b/extra/unix/unix.factor
index c68f127226..8085e4a51a 100755
--- a/extra/unix/unix.factor
+++ b/extra/unix/unix.factor
@@ -87,6 +87,7 @@ FUNCTION: int getgrnam_r ( char* name, group* grp, char* buffer, size_t bufsize,
 FUNCTION: int getpwnam_r ( char* login, passwd* pwd, char* buffer, size_t bufsize, passwd** result ) ;
 FUNCTION: int getgroups ( int gidsetlen, gid_t* gidset ) ;
 FUNCTION: int gethostname ( char* name, int len ) ;
+FUNCTION: int getsockname ( int socket, sockaddr* address, socklen_t* address_len ) ;
 FUNCTION: uid_t getuid ;
 FUNCTION: uint htonl ( uint n ) ;
 FUNCTION: ushort htons ( ushort n ) ;