diff --git a/init/bootchart.h b/init/bootchart.h
index 39d2d4f..ed65e8a 100644
--- a/init/bootchart.h
+++ b/init/bootchart.h
@@ -26,6 +26,7 @@
 extern int   bootchart_init(void);
 extern int   bootchart_step(void);
 extern void  bootchart_finish(void);
+extern long long  bootchart_gettime(void);
 
 # define BOOTCHART_POLLING_MS   200   /* polling period in ms */
 # define BOOTCHART_DEFAULT_TIME_SEC    (2*60)  /* default polling time in seconds */