diff --git a/os/rt/src/chschd.c b/os/rt/src/chschd.c
index 322491ce7..540b1c296 100644
--- a/os/rt/src/chschd.c
+++ b/os/rt/src/chschd.c
@@ -582,7 +582,7 @@ void chSchDoReschedule(void) {
 #if CH_CFG_TIME_QUANTUM > 0
   /* If CH_CFG_TIME_QUANTUM is enabled then there are two different scenarios
      to handle on preemption: time quantum elapsed or not.*/
-  if (currp->ticks == (tslices_t)0) {
+  if (otp->ticks == (tslices_t)0) {
 
     /* The thread consumed its time quantum so it is enqueued behind threads
        with same priority level, however, it acquires a new time quantum.*/
diff --git a/readme.txt b/readme.txt
index 74d38a330..e1664bb3a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -93,6 +93,8 @@
        MEMS Accelerometers.
 - NEW: Safer messages mechanism for sandboxes (to be backported to 20.3.1).
 - NEW: Added latency measurement test application.
+- FIX: Schedule anomaly when CH_CFG_TIME_QUANTUM is greater than zero
+       (bug #1105)(backported to 20.3.2)(backported to 19.1.5).
 - FIX: Fixed Virtual Timers corner case (bug #1104)
        (backported to 20.3.2)(backported to 19.1.5).
 - FIX: Fixed GCC6 problem breaks Cortex-M0 port (bug #985)