diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 5bc9b5ac..511c9497 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -55,16 +55,6 @@ random_u32(void)
 
 #define NEAR_TIMER_LIMIT 4
 
-#ifdef TIME_T_IS_64BIT
-#define TIME_INFINITY 0x7fffffffffffffff
-#else
-#ifdef TIME_T_IS_SIGNED
-#define TIME_INFINITY 0x7fffffff
-#else
-#define TIME_INFINITY 0xffffffff
-#endif
-#endif
-
 static list near_timers, far_timers;
 static bird_clock_t first_far_timer = TIME_INFINITY;
 
diff --git a/sysdep/unix/timer.h b/sysdep/unix/timer.h
index afb2668a..482f531c 100644
--- a/sysdep/unix/timer.h
+++ b/sysdep/unix/timer.h
@@ -36,4 +36,14 @@ bird_clock_t tm_parse_date(char *);	/* Convert date to bird_clock_t */
 void tm_format_date(char *, bird_clock_t);	/* Convert bird_clock_t to date */
 #define TM_DATE_BUFFER_SIZE 12		/* Buffer size required by tm_format_date */
 
+#ifdef TIME_T_IS_64BIT
+#define TIME_INFINITY 0x7fffffffffffffff
+#else
+#ifdef TIME_T_IS_SIGNED
+#define TIME_INFINITY 0x7fffffff
+#else
+#define TIME_INFINITY 0xffffffff
+#endif
+#endif
+
 #endif