diff --git a/os/hal/ports/STM32/LLD/TIMv1/hal_st_lld.h b/os/hal/ports/STM32/LLD/TIMv1/hal_st_lld.h
index 2b7f53760..f98e5b82b 100644
--- a/os/hal/ports/STM32/LLD/TIMv1/hal_st_lld.h
+++ b/os/hal/ports/STM32/LLD/TIMv1/hal_st_lld.h
@@ -467,7 +467,7 @@
 #define ST_LLD_NUM_ALARMS                   STM32_ST_ENFORCE_ALARMS
 #endif
 
-#elif OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING
+#elif OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC
 
 #define STM32_ST_USE_SYSTICK                TRUE
 #define STM32_ST_USE_TIM2                   FALSE
diff --git a/readme.txt b/readme.txt
index 9f48474d8..fb68eb7f9 100644
--- a/readme.txt
+++ b/readme.txt
@@ -74,6 +74,7 @@
 *****************************************************************************
 
 *** 20.3.3 ***
+- FIX: Fixed wrong check in STM32 ST driver (bug #1129).
 - FIX: Fixed OSAL does not allow 64 bits resolution values (bug #1128).
 - FIX: Fixed wrong SDMMC RCC macros for STM32H7xx (bug #1127).
 - FIX: Fixed STM32 ADCv3 hangin on initialization (bug #1126).