diff --git a/src/gb/gprs_ns2_message.c b/src/gb/gprs_ns2_message.c
index cd49896..bfb8781 100644
--- a/src/gb/gprs_ns2_message.c
+++ b/src/gb/gprs_ns2_message.c
@@ -168,10 +168,20 @@
 
 static int ns_vc_tx(struct gprs_ns2_vc *nsvc, struct msgb *msg)
 {
-	rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
-	rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_length(msg));
+	unsigned int bytes = msgb_length(msg);
+	int rc;
 
-	return nsvc->bind->send_vc(nsvc, msg);
+
+	rc = nsvc->bind->send_vc(nsvc, msg);
+	if (rc < 0) {
+		rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT_DROP]);
+		rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT_DROP], bytes);
+	} else {
+		rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
+		rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], bytes);
+	}
+
+	return rc;
 }
 
 /* transmit functions */