--- epan/dissectors/packet-bootp.c
+++ epan/dissectors/packet-bootp.c
@@ -1216,7 +1216,7 @@
 		if (code == pkt_ccc_option) {
 			skip_opaque = TRUE;
 			proto_item_append_text(vti,
-				"CableLabs Client Configuration (%d bytes)");
+				"CableLabs Client Configuration (%d bytes)", optlen);
 			optend = optoff + optlen;
 			while (optoff < optend) {
 				switch (pkt_ccc_protocol_version) {