1 files changed, 2 insertions, 2 deletions
diff --git a/os/rt/src/chthreads.c b/os/rt/src/chthreads.c
index 49abadb2d..84a062b86 100644
--- a/os/rt/src/chthreads.c
+++ b/os/rt/src/chthreads.c
@@ -670,7 +670,7 @@ void chThdSleepUntil(systime_t time) {
   sysinterval_t interval;
 
   chSysLock();
-  interval = chTimeDiffX(time, chVTGetSystemTimeX());
+  interval = chTimeDiffX(chVTGetSystemTimeX(), time);
   if (interval > (sysinterval_t)0) {
     chThdSleepS(interval);
   }
@@ -697,7 +697,7 @@ systime_t chThdSleepUntilWindowed(systime_t prev, systime_t next) {
   chSysLock();
   time = chVTGetSystemTimeX();
   if (chTimeIsInRangeX(time, prev, next)) {
-    chThdSleepS(chTimeDiffX(next, time));
+    chThdSleepS(chTimeDiffX(time, next));
   }
   chSysUnlock();