diff --git a/ports/stm32/adc.c b/ports/stm32/adc.c
index ace6505a3f..50abbebe15 100644
--- a/ports/stm32/adc.c
+++ b/ports/stm32/adc.c
@@ -329,9 +329,7 @@ STATIC void adc_config_channel(ADC_HandleTypeDef *adc_handle, uint32_t channel)
 #elif defined(STM32F4) || defined(STM32F7)
     sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
 #elif defined(STM32H7)
-    if (channel == ADC_CHANNEL_VREFINT
-        || channel == ADC_CHANNEL_TEMPSENSOR
-        || channel == ADC_CHANNEL_VBAT) {
+    if (__HAL_ADC_IS_CHANNEL_INTERNAL(channel)) {
         sConfig.SamplingTime = ADC_SAMPLETIME_387CYCLES_5;
     } else {
         sConfig.SamplingTime = ADC_SAMPLETIME_8CYCLES_5;
@@ -341,9 +339,7 @@ STATIC void adc_config_channel(ADC_HandleTypeDef *adc_handle, uint32_t channel)
     sConfig.OffsetRightShift = DISABLE;
     sConfig.OffsetSignedSaturation = DISABLE;
 #elif defined(STM32L4)
-    if (channel == ADC_CHANNEL_VREFINT
-        || channel == ADC_CHANNEL_TEMPSENSOR
-        || channel == ADC_CHANNEL_VBAT) {
+    if (__HAL_ADC_IS_CHANNEL_INTERNAL(channel)) {
         sConfig.SamplingTime = ADC_SAMPLETIME_247CYCLES_5;
     } else {
         sConfig.SamplingTime = ADC_SAMPLETIME_12CYCLES_5;