diff --git a/6_line_following/main/line_following.c b/6_line_following/main/line_following.c
index a601b0f..0a1f120 100644
--- a/6_line_following/main/line_following.c
+++ b/6_line_following/main/line_following.c
@@ -71,11 +71,11 @@ void calculate_error()
         {
             all_black_flag = 0;
         }
-        if(line_sensor_readings.adc_reading[i] > 700)
+        if(line_sensor_readings.adc_reading[i] > BLACK_BOUNDARY)
         {
             k = 1;
         }
-        if(line_sensor_readings.adc_reading[i] < 700)
+        if(line_sensor_readings.adc_reading[i] < BLACK_BOUNDARY)
         {
             k = 0;
         }
@@ -165,4 +165,4 @@ void app_main()
 {
     xTaskCreate(&line_follow_task, "line_follow_task", 4096, NULL, 1, NULL);
     start_tuning_http_server();
-}
\ No newline at end of file
+}