diff --git a/src/encoding.cpp b/src/encoding.cpp
index 51b0fbe..13848aa 100644
--- a/src/encoding.cpp
+++ b/src/encoding.cpp
@@ -267,7 +267,7 @@
 
 	block->u.Packet_Downlink_Assignment.MAC_MODE            = 0x0;          // Dynamic Allocation
 	block->u.Packet_Downlink_Assignment.RLC_MODE            = 0x0;          // RLC acknowledged mode
-	block->u.Packet_Downlink_Assignment.CONTROL_ACK         = old_downlink; // NW establishes no new DL TBF for the MS with running timer T3192
+	block->u.Packet_Downlink_Assignment.CONTROL_ACK         = tbf->was_releasing; // NW establishes no new DL TBF for the MS with running timer T3192
 	block->u.Packet_Downlink_Assignment.TIMESLOT_ALLOCATION = 0;   // timeslot(s)
 	for (tn = 0; tn < 8; tn++) {
 		if (tbf->pdch[tn])