diff --git a/RELNOTES b/RELNOTES
index 89070169..0c20cea8 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -57,6 +57,10 @@ by Eric Young (eay@cryptsoft.com).
 - Fixed util/bindvar.sh error handling.
   [ISC-Bugs #41973]
 
+- Correct error message in relay to use remote id length instead
+  of circuit id length.
+  [ISC-Bugs #42556]
+
 			Changes since 4.3.4b1
 
 - None
diff --git a/relay/dhcrelay.c b/relay/dhcrelay.c
index 5ecd2656..2723356b 100644
--- a/relay/dhcrelay.c
+++ b/relay/dhcrelay.c
@@ -1174,7 +1174,7 @@ add_relay_agent_options(struct interface_info *ip, struct dhcp_packet *packet,
 	if (ip->remote_id) {
 		if (ip->remote_id_len > 255 || ip->remote_id_len < 1)
 			log_fatal("Remote ID length %d out of range [1-255] "
-				  "on %s\n", ip->circuit_id_len, ip->name);
+				  "on %s\n", ip->remote_id_len, ip->name);
 		optlen += ip->remote_id_len + 2;    /* RAI_REMOTE_ID + len */
 	}