1 files changed, 1 insertions, 1 deletions
diff --git a/os/rt/include/chvt.h b/os/rt/include/chvt.h
index 70c3182e6..f1bb4d9f2 100644
--- a/os/rt/include/chvt.h
+++ b/os/rt/include/chvt.h
@@ -450,7 +450,7 @@ static inline void chVTDoTickI(void) {
   ch.vtlist.next->delta -= nowdelta;
 
   /* Recalculating the next alarm time.*/
-  delta = chTimeDiffX(now, chTimeAddX(ch.vtlist.lasttime, vtp->delta));
+  delta = vtp->delta - chTimeDiffX(ch.vtlist.lasttime, now);
   if (delta < (sysinterval_t)CH_CFG_ST_TIMEDELTA) {
     delta = (sysinterval_t)CH_CFG_ST_TIMEDELTA;
   }