diff --git a/src/osmo_e1.c b/src/osmo_e1.c
index 2ad535e..5134965 100644
--- a/src/osmo_e1.c
+++ b/src/osmo_e1.c
@@ -648,7 +648,7 @@
 
 	for (i = 1; i < ARRAY_SIZE(e1i->ts); i++) {
 		struct osmo_e1_instance_ts *e1t = &e1i->ts[i];
-		e1_rx_tsN(e1t, in_frame[1]);
+		e1_rx_tsN(e1t, in_frame[i]);
 	}
 
 	return 0;