diff --git a/src/gb/gprs_ns2_vc_fsm.c b/src/gb/gprs_ns2_vc_fsm.c
index 8604bbe..9f0c5f4 100644
--- a/src/gb/gprs_ns2_vc_fsm.c
+++ b/src/gb/gprs_ns2_vc_fsm.c
@@ -345,6 +345,9 @@
 	} else {
 		/* we are on the receiving end. The initiator who sent RESET is responsible to UNBLOCK! */
 		switch (event) {
+		case GPRS_NS2_EV_BLOCK:
+			ns2_tx_block_ack(priv->nsvc);
+			break;
 		case GPRS_NS2_EV_UNBLOCK:
 			ns2_tx_unblock_ack(priv->nsvc);
 			osmo_fsm_inst_state_chg(fi, GPRS_NS2_ST_UNBLOCKED,