diff --git a/library/L1CTL_Types.ttcn b/library/L1CTL_Types.ttcn
index 1b50703..d525924 100644
--- a/library/L1CTL_Types.ttcn
+++ b/library/L1CTL_Types.ttcn
@@ -650,6 +650,7 @@
 		payload := {
 			dm_est_req := {
 				tsc := tsc,
+				h0h1 := -,
 				tch_mode := L1CTL_CHAN_MODE_SIGN,
 				audio_mode := t_L1CTL_AudioModeFwd
 			}