diff --git a/lightningd/peer_control.c b/lightningd/peer_control.c
index e06c262ea..a71bc358e 100644
--- a/lightningd/peer_control.c
+++ b/lightningd/peer_control.c
@@ -2464,52 +2464,7 @@ static void custommsg_payload_serialize(struct custommsg_payload *payload,
 					struct json_stream *stream,
 					struct plugin *plugin)
 {
-	/* Backward compat for broken custommsg: if we get a custommsg
-	 * from an old c-lightning node, then we must identify and
-	 * strip the prefix from the payload. If it's a new one, we
-	 * need to add the frame for the `message` for backward
-	 * compatibility. */
-	size_t msglen = tal_bytelen(payload->msg), framedlen, unframedlen, max;
-	const u8 *unframed, *framed, *p = payload->msg;
-	u8 *tmp;
-	max = msglen;
-
-	if (msglen >= 4 && fromwire_u16(&p, &max) == WIRE_CUSTOMMSG_OUT &&
-	    fromwire_u16(&p, &max) == msglen - 4 && deprecated_apis) {
-		/* This is from an old c-lightning implementation that
-		 * erroneously sent the framed message over the
-		 * connection. */
-		unframed = payload->msg + 4;
-		unframedlen = msglen - 4;
-		framed = payload->msg;
-		framedlen = msglen;
-	} else {
-		/* This is from a new c-lightning, which correctly
-		 * sent the raw custommsg without framing. We still
-		 * need to reconstruct the wrong message since plugins
-		 * may rely on it. */
-		if (deprecated_apis) {
-			tmp = tal_arr(tmpctx, u8, 0);
-			towire_u16(&tmp, WIRE_CUSTOMMSG_OUT);
-			towire_u16(&tmp, msglen);
-			towire(&tmp, payload->msg, msglen);
-			framedlen = msglen + 4;
-			framed = tmp;
-		}
-
-		unframed = payload->msg;
-		unframedlen = msglen;
-	}
-
-	if (deprecated_apis) {
-		json_add_hex(stream, "message", framed, framedlen);
-		json_add_string(
-		    stream, "warning",
-		    "The `message` field is deprecated and has been replaced "
-		    "with the payload` field which skips the internal type and "
-		    "the length prefix. Please update to use that instead.");
-	}
-	json_add_hex(stream, "payload", unframed, unframedlen);
+	json_add_hex_talarr(stream, "payload", payload->msg);
 	json_add_node_id(stream, "peer_id", &payload->peer_id);
 }