diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 9cab1dc2..4e5dbfd8 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -175,7 +175,7 @@ tm_shot(void)
 
   if (first_far_timer <= now)
     {
-      clock_t limit = now + NEAR_TIMER_LIMIT;
+      bird_clock_t limit = now + NEAR_TIMER_LIMIT;
       first_far_timer = TIME_INFINITY;
       n = HEAD(far_timers);
       while (m = n->next)
diff --git a/sysdep/unix/timer.h b/sysdep/unix/timer.h
index 00307f73..ab04aa44 100644
--- a/sysdep/unix/timer.h
+++ b/sysdep/unix/timer.h
@@ -22,7 +22,7 @@ typedef struct timer {
   unsigned randomize;			/* Amount of randomization */
   unsigned recurrent;			/* Timer recurrence */
   node n;				/* Internal link */
-  clock_t expires;			/* 0=inactive */
+  bird_clock_t expires;			/* 0=inactive */
 } timer;
 
 timer *tm_new(pool *);
@@ -30,6 +30,6 @@ void tm_start(timer *, unsigned after);
 void tm_stop(timer *);
 void tm_dump_all(void);
 
-extern clock_t now;
+extern bird_clock_t now;
 
 #endif