diff --git a/stm-firmware/adc-meas.c b/stm-firmware/adc-meas.c
index 635353d..d92ae02 100644
--- a/stm-firmware/adc-meas.c
+++ b/stm-firmware/adc-meas.c
@@ -52,11 +52,6 @@ volatile float * volatile stream_buffer = NULL;
 volatile uint32_t stream_count;
 volatile uint32_t stream_pos;
 
-/**
- * @brief Conversion macro: ADC value to resistance
- */
-#define ADC_TO_RES(adc) ((float)(adc) / 4096.0f * 2500.0f)
-
 static inline void adc_pt1000_stop_sample_frequency_timer()
 {
 	TIM2->CR1 &= ~TIM_CR1_CEN;