diff --git a/os/hal/ports/STM32/LLD/DACv1/dac_lld.c b/os/hal/ports/STM32/LLD/DACv1/dac_lld.c
index 07902f06a..be9ebe3cd 100644
--- a/os/hal/ports/STM32/LLD/DACv1/dac_lld.c
+++ b/os/hal/ports/STM32/LLD/DACv1/dac_lld.c
@@ -408,7 +408,7 @@ void dac_lld_stop_conversion(DACDriver *dacp) {
 
   dmaStreamDisable(dacp->params->dma);
 #if STM32_DAC_DUAL_MODE == FALSE
-  dacp->params->dac->CR  = dacp->params->regmask;
+  dacp->params->dac->CR &= dacp->params->regmask;
   dacp->params->dac->CR |= DAC_CR_EN1 << dacp->params->regshift;
   *(&dacp->params->dac->DHR12R1 + dacp->params->dataoffset) = 0U;
 #else