diff --git a/appl/ftp/ftp/security.h b/appl/ftp/ftp/security.h
index 99e6b2c38..28bc65dfb 100644
--- a/appl/ftp/ftp/security.h
+++ b/appl/ftp/ftp/security.h
@@ -121,6 +121,7 @@ void prot (char *);
 void delete_ftp_command (void);
 void new_ftp_command (char *);
 int sec_userok (char *);
+int sec_session(char *);
 int secure_command (void);
 enum protection_level get_command_prot(void);
 #else