diff --git a/lib/sigevent.h b/lib/sigevent.h
index 20012af..62b944a 100644
--- a/lib/sigevent.h
+++ b/lib/sigevent.h
@@ -44,10 +44,10 @@
  * - array of quagga_signal_t's describing signals to handle
  *   and handlers to use for each signal
  */
-void signal_init (struct thread_master *m, int sigc, 
+extern void signal_init (struct thread_master *m, int sigc, 
                          struct quagga_signal_t *signals);
 
 /* check whether there are signals to handle, process any found */
-int quagga_sigevent_process (void);
+extern int quagga_sigevent_process (void);
 
 #endif /* _QUAGGA_SIGNAL_H */