diff --git a/src/main.c b/src/main.c
index 3b39512..824a5c7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -543,6 +543,7 @@ static void rf_rx(void)
 			int64_t Q = sQ;
 
 			I *= gain;
+			I -= max_amplitude / 2 + 1;
 			I /= max_amplitude;
 
 			if (I > 127)
@@ -553,6 +554,7 @@ static void rf_rx(void)
 			*blockptr++ = (uint8_t)I + 128;
 
 			Q *= gain;
+			Q -= max_amplitude / 2 + 1;
 			Q /= max_amplitude;
 
 			if (Q > 127)