diff --git a/os/hal/ports/STM32/STM32G0xx/hal_lld.c b/os/hal/ports/STM32/STM32G0xx/hal_lld.c
index a39b2adb2..09ea8e6cc 100644
--- a/os/hal/ports/STM32/STM32G0xx/hal_lld.c
+++ b/os/hal/ports/STM32/STM32G0xx/hal_lld.c
@@ -151,7 +151,7 @@ void stm32_clock_init(void) {
 
 #if STM32_HSI16_ENABLED
   /* HSI activation.*/
-  RCC->CR |= RCC_CR_HSION;
+  RCC->CR |= RCC_CR_HSION | STM32_HSIDIV;
   while ((RCC->CR & RCC_CR_HSIRDY) == 0)
     ;                                       /* Wait until HSI16 is stable.  */
 #endif
diff --git a/readme.txt b/readme.txt
index 378f23ad4..1635bcdda 100644
--- a/readme.txt
+++ b/readme.txt
@@ -117,6 +117,8 @@
        MEMS Accelerometers.
 - NEW: Safer messages mechanism for sandboxes (to be backported to 20.3.1).
 - NEW: Added latency measurement test application.
+- FIX: Ignored HSIDIV setting on STM32G0xx (bug #1121)
+       (backported to 20.3.3).
 - FIX: Fix incorrect variable name in recursive mutex handling (bug #1119).
 - FIX: Fixed several problems in STM32 ADCv4 (bug #1116)
        (backported to 20.3.2).