1 files changed, 2 insertions, 1 deletions
diff --git a/os/rt/src/chsys.c b/os/rt/src/chsys.c
index 4e2102b89..7754e546d 100644
--- a/os/rt/src/chsys.c
+++ b/os/rt/src/chsys.c
@@ -191,9 +191,10 @@ void chSysTimerHandlerI(void) {
 
 #if CH_CFG_TIME_QUANTUM > 0
   /* Running thread has not used up quantum yet? */
-  if (currp->p_preempt > 0)
+  if (currp->p_preempt > 0U) {
     /* Decrement remaining quantum.*/
     currp->p_preempt--;
+  }
 #endif
 #if CH_DBG_THREADS_PROFILING == TRUE
   currp->p_time++;