Index: timecall.h
===================================================================
--- timecall.h	(revision 50)
+++ timecall.h	(revision 51)
@@ -83,7 +83,7 @@
 Returns current "time".
 **/
 
-extern char raydium_timecall_devrtc_rate_change (unsigned long new);
+extern signed char raydium_timecall_devrtc_rate_change (unsigned long new);
 /**
 Internal, Linux only: Modifies RTC clock rate.
 **/