diff --git a/filter/bs412.c b/filter/bs412.c
index 856e21a..9414ad1 100644
--- a/filter/bs412.c
+++ b/filter/bs412.c
@@ -29,7 +29,11 @@ void init_bs412(BS412Compressor* mpx, float mpx_deviation, float target_power, f
 }
 
 float bs412_compress(BS412Compressor* mpx, float sample) {
-	mpx->average += sample * sample * mpx->mpx_deviation * mpx->mpx_deviation;
+	if(mpx->lookahead_counter >= BS412_LOOKAHEAD) mpx->lookahead_counter = 0;
+	float process_sample = mpx->lookahead_samples[BS412_LOOKAHEAD - 1 - mpx->lookahead_counter]; // get sample from the other end
+	mpx->lookahead_samples[mpx->lookahead_counter++] = sample; // write to the first end
+
+	mpx->average += process_sample * process_sample * mpx->mpx_deviation * mpx->mpx_deviation;
 	mpx->average_counter++;
 
 	float avg_power = mpx->average / mpx->average_counter;