diff --git a/components/adc/include/continuous_adc.hpp b/components/adc/include/continuous_adc.hpp
index 3f2c7861b..78be586f0 100644
--- a/components/adc/include/continuous_adc.hpp
+++ b/components/adc/include/continuous_adc.hpp
@@ -205,7 +205,7 @@ class ContinuousAdc : public espp::BaseComponent {
 #if !CONFIG_IDF_TARGET_ESP32
       if (output_format_ == ADC_DIGI_OUTPUT_FORMAT_TYPE2) {
         if (check_valid_data(p)) {
-          auto unit = p->type2.unit;
+          auto unit = (adc_unit_t)p->type2.unit;
           auto channel = (adc_channel_t)p->type2.channel;
           auto data = p->type2.data;
           auto id = get_id(unit, channel);