diff --git a/ADC_Temp.c b/ADC_Temp.c
index 233fdee..e82b631 100644
--- a/ADC_Temp.c
+++ b/ADC_Temp.c
@@ -183,7 +183,7 @@ void init_fast_lookup_table(eAlg use_alg) {
     }
 }
 
-int16_t get_temperature_fast(uint16_t adc_value, adc_temp_lookup *fast_temp_lookup, uint16_t size_fast_temp_lookup) {
+int16_t get_temperature_fast(uint16_t adc_value, const adc_temp_lookup *fast_temp_lookup, uint16_t size_fast_temp_lookup) {
     // Простой поиск в таблице с линейной интерполяцией
     uint16_t index = adc_value /
                      (uint8_t) roundf(ADC_MAX / ((float) size_fast_temp_lookup - 1)); // Делим на 16 для TABLE_SIZE_LOOKUP = 256
diff --git a/ADC_Temp.h b/ADC_Temp.h
index b08fa8c..bc4b105 100644
--- a/ADC_Temp.h
+++ b/ADC_Temp.h
@@ -41,6 +41,6 @@ typedef struct {
 
 void init_fast_lookup_table(eAlg use_alg);
 float get_temperature_from_adc(uint16_t adc_value, eAlg alg);
-int16_t get_temperature_fast(uint16_t adc_value, adc_temp_lookup *fast_temp_lookup, uint16_t size_fast_temp_lookup);
+int16_t get_temperature_fast(uint16_t adc_value, const adc_temp_lookup *fast_temp_lookup, uint16_t size_fast_temp_lookup);
 
 #endif //MDF_ADC_TEMP_KST45_14_2_H