diff --git a/os/hal/ports/STM32/LLD/SDMMCv2/hal_sdc_lld.c b/os/hal/ports/STM32/LLD/SDMMCv2/hal_sdc_lld.c
index 9740df248..79701e04c 100644
--- a/os/hal/ports/STM32/LLD/SDMMCv2/hal_sdc_lld.c
+++ b/os/hal/ports/STM32/LLD/SDMMCv2/hal_sdc_lld.c
@@ -409,7 +409,7 @@ void sdc_lld_stop(SDCDriver *sdcp) {
 void sdc_lld_start_clk(SDCDriver *sdcp) {
 
   /* Initial clock setting: 400kHz, 1bit mode.*/
-  sdcp->sdmmc->CLKCR  = sdc_lld_clkdiv(sdcp, 4000000);
+  sdcp->sdmmc->CLKCR  = sdc_lld_clkdiv(sdcp, 400000);
   sdcp->sdmmc->POWER |= SDMMC_POWER_PWRCTRL_0 | SDMMC_POWER_PWRCTRL_1;
 /* TODO sdcp->sdmmc->CLKCR |= SDMMC_CLKCR_CLKEN;*/
 
diff --git a/readme.txt b/readme.txt
index 058e397ee..fb25a6f35 100644
--- a/readme.txt
+++ b/readme.txt
@@ -141,6 +141,8 @@
        MEMS Accelerometers.
 - NEW: Safer messages mechanism for sandboxes.
 - NEW: Added latency measurement test application.
+- FIX: Fixed STM32 SDMMCv2 driver invalid initial clock settings (bug #1160)
+       (backported to 20.3.4).
 - FIX: Fixed wrong wait states calculation in STM32G4xx, insufficient
        boost settings (bug #1159)(backported to 20.3.4).
 - FIX: Fixed warning in STM32 ADCv4 (bug #1158)