diff --git a/cpu/stm32/periph/adc_l1.c b/cpu/stm32/periph/adc_l1.c
index 93473f47c3cab..eeab76d997532 100644
--- a/cpu/stm32/periph/adc_l1.c
+++ b/cpu/stm32/periph/adc_l1.c
@@ -156,12 +156,12 @@ int32_t adc_sample(adc_t line, adc_res_t res)
     prep();
 
     /* mask and set resolution, conversion channel and single read */
-    ADC1->CR1 = (ADC1->CR1 & ~ADC_CR1_RES_Msk) | (res & ADC_CR1_RES_Msk);
+    ADC1->CR1 = (ADC1->CR1 & ~ADC_CR1_RES) | (res & ADC_CR1_RES);
     ADC1->SQR1 &= ~ADC_SQR1_L;
     ADC1->SQR5 = adc_config[line].chan;
 
     /* only set ADON when ADONS bit is cleared (ADC not ready) */
-    if (!(ADC1->SR & ADC_SR_ADONS_Msk)) {
+    if (!(ADC1->SR & ADC_SR_ADONS)) {
         ADC1->CR2 |= ADC_CR2_ADON;
     }
 
@@ -176,7 +176,7 @@ int32_t adc_sample(adc_t line, adc_res_t res)
 
     /* wait for ADC to become ready before disabling it */
     while (!(ADC1->SR & ADC_SR_ADONS)) {}
-    ADC1->CR2 &= ~ADC_CR2_ADON_Msk;
+    ADC1->CR2 &= ~ADC_CR2_ADON;
 
     /* power off and unlock device again */
     done();