diff --git a/src/coding/gsm0503_coding.c b/src/coding/gsm0503_coding.c
index 6f19ed9..98439e3 100644
--- a/src/coding/gsm0503_coding.c
+++ b/src/coding/gsm0503_coding.c
@@ -2222,6 +2222,7 @@
 			tch_amr_reassemble(tch_data, conv, 39);
 			len = 5;
 			goto out;
+		case AFS_SID_UPDATE:
 		case AFS_ONSET:
 			len = 0;
 			goto out;