diff --git a/include/syslog.h b/include/syslog.h
index a391eee11c..0a7ae81e13 100644
--- a/include/syslog.h
+++ b/include/syslog.h
@@ -52,6 +52,13 @@
  *   LOG_PID      - Include PID with each message.
  */
 
+#define LOG_PID         0x01    /* log the pid with each message */
+#define LOG_CONS        0x02    /* log on the console if errors in sending */
+#define LOG_ODELAY      0x04    /* delay open until first syslog() (default) */
+#define LOG_NDELAY      0x08    /* don't delay open */
+#define LOG_NOWAIT      0x10    /* don't wait for console forks: DEPRECATED */
+#define LOG_PERROR      0x20    /* log to stderr as well */
+
 /* Note: openlog() is not currently supported */
 
 /* The facility argument is used to specify what type of program is logging
@@ -162,9 +169,8 @@ extern "C"
  *
  ****************************************************************************/
 
-#if 0 /* Not supported */
-void openlog(FAR const char *ident, int option, int facility);
-#endif
+/* Not supported */
+#define openlog(i, o, f) {(void)(i); (void)(o); (void)(f);}
 
 /****************************************************************************
  * Name: closelog
@@ -176,9 +182,8 @@ void openlog(FAR const char *ident, int option, int facility);
  *
  ****************************************************************************/
 
-#if 0 /* Not supported */
-void closelog(void);
-#endif
+/* Not supported */
+#define closelog()
 
 /****************************************************************************
  * Name: syslog and vsyslog