diff --git a/core/sys/clock.h b/core/sys/clock.h
index 966dc4a2d..f06e8a436 100644
--- a/core/sys/clock.h
+++ b/core/sys/clock.h
@@ -53,7 +53,7 @@
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
- * $Id: clock.h,v 1.5 2008/07/07 23:38:46 adamdunkels Exp $
+ * $Id: clock.h,v 1.6 2008/07/10 17:09:32 adamdunkels Exp $
  */
 #ifndef __CLOCK_H__
 #define __CLOCK_H__
@@ -96,7 +96,7 @@ void clock_delay(unsigned int);
 int clock_fine_max(void);
 unsigned short clock_fine(void);
 
-unsigned long clock_seconds(void);
+CCIF unsigned long clock_seconds(void);
 
 
 #endif /* __CLOCK_H__ */