diff --git a/src/battery.cpp b/src/battery.cpp
index bb2ffce7..c7a43070 100644
--- a/src/battery.cpp
+++ b/src/battery.cpp
@@ -3,6 +3,7 @@
 // Local logging tag
 static const char TAG[] = "main";
 
+#ifdef HAS_BATTERY_PROBE
 esp_adc_cal_characteristics_t *adc_characs =
     (esp_adc_cal_characteristics_t *)calloc(
         1, sizeof(esp_adc_cal_characteristics_t));
@@ -10,6 +11,7 @@ esp_adc_cal_characteristics_t *adc_characs =
 static const adc1_channel_t adc_channel = HAS_BATTERY_PROBE;
 static const adc_atten_t atten = ADC_ATTEN_DB_11;
 static const adc_unit_t unit = ADC_UNIT_1;
+#endif
 
 void calibrate_voltage(void) {
 #ifdef HAS_BATTERY_PROBE