diff --git a/src/atsamd/adc.c b/src/atsamd/adc.c
index 8f23e9cb..26465c2d 100644
--- a/src/atsamd/adc.c
+++ b/src/atsamd/adc.c
@@ -21,7 +21,8 @@ static const uint8_t adc_pins[] = {
 };
 #elif CONFIG_MACH_SAMD51
 
-#define SAMD51_ADC_SYNC(ADC, BIT) while(ADC->SYNCBUSY.reg & ADC_SYNCBUSY_ ## BIT)
+#define SAMD51_ADC_SYNC(ADC, BIT) \
+    while(ADC->SYNCBUSY.reg & ADC_SYNCBUSY_ ## BIT)
 static const uint8_t adc_pins[] = {
     /* ADC0 */
     GPIO('A', 2), GPIO('A', 3), GPIO('B', 8), GPIO('B', 9), GPIO('A', 4),
@@ -108,14 +109,16 @@ adc_init(void)
     while(ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_REFCTRL);
     ADC0->SAMPCTRL.reg = ADC_SAMPCTRL_SAMPLEN(63);
     while (ADC0->SYNCBUSY.reg & ADC_SYNCBUSY_SAMPCTRL);
-    ADC0->CTRLA.reg = ADC_CTRLA_PRESCALER(ADC_CTRLA_PRESCALER_DIV32_Val) | ADC_CTRLA_ENABLE;
+    ADC0->CTRLA.reg = (ADC_CTRLA_PRESCALER(ADC_CTRLA_PRESCALER_DIV32_Val)
+                       | ADC_CTRLA_ENABLE);
 
     // ADC1
     ADC1->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1;
     while(ADC1->SYNCBUSY.reg & ADC_SYNCBUSY_REFCTRL);
     ADC1->SAMPCTRL.reg = ADC_SAMPCTRL_SAMPLEN(63);
     while(ADC1->SYNCBUSY.reg & ADC_SYNCBUSY_SAMPCTRL);
-    ADC1->CTRLA.reg = ADC_CTRLA_PRESCALER(ADC_CTRLA_PRESCALER_DIV32_Val) | ADC_CTRLA_ENABLE;
+    ADC1->CTRLA.reg = (ADC_CTRLA_PRESCALER(ADC_CTRLA_PRESCALER_DIV32_Val)
+                       | ADC_CTRLA_ENABLE);
 #endif
 }