diff --git a/os/rt/include/chschd.h b/os/rt/include/chschd.h
index 78def25a4..a42d53959 100644
--- a/os/rt/include/chschd.h
+++ b/os/rt/include/chschd.h
@@ -770,7 +770,7 @@ static inline void chSchPreemption(void) {
     }
   }
 #else /* CH_CFG_TIME_QUANTUM == 0 */
-  if (p1 >= p2) {
+  if (p1 > p2) {
     chSchDoRescheduleAhead();
   }
 #endif /* CH_CFG_TIME_QUANTUM == 0 */
diff --git a/readme.txt b/readme.txt
index d83b4e351..2e6960f69 100644
--- a/readme.txt
+++ b/readme.txt
@@ -73,6 +73,7 @@
 *****************************************************************************
 
 *** 16.1.5 ***
+- RT:  Fixed bug in chSchPreemption() function (bug #728).
 - HAL: Fixed prescaler not initialized in STM32 ADCv1 (bug #725).
 - HAL: Fixed missing DAC section in STM32F072 mcuconf.h files (bug #724).