diff --git a/impl/src/transmission.c b/impl/src/transmission.c
index a1ac60b..79dde55 100644
--- a/impl/src/transmission.c
+++ b/impl/src/transmission.c
@@ -92,7 +92,7 @@ result_t transmission_filter_packet(
 		firinterp_crcf_execute(ctx->rrc_interp, packet[i], output + (RRC_SPS*i));
 	}
 
-	*output_size = RRC_SPS*TRANSMISSION_RAMP_DOWN_LEN;
+	*output_size = RRC_SPS*packet_size;
 
 	return OK;
 }