diff --git a/bitcoin/chainparams.h b/bitcoin/chainparams.h
index a8e74fe17e8e..05794f5c19b1 100644
--- a/bitcoin/chainparams.h
+++ b/bitcoin/chainparams.h
@@ -29,7 +29,7 @@ struct chainparams {
 	 *
 	 * - Bitcoin mainet with port number 9735 or the corresponding hexadecimal `0x2607`;
 	 * - Bitcoin testnet with port number 19735 (`0x4D17`);
-	 * - Bitcoin signet with port number 39735 (`0xF87`).
+	 * - Bitcoin signet with port number 39735 (`0x9B37`).
 	 */
 	const int ln_port;
 	const char *cli;
diff --git a/contrib/pyln-spec/bolt1/pyln/spec/bolt1/text.py b/contrib/pyln-spec/bolt1/pyln/spec/bolt1/text.py
index 96c27eabf2e7..722ededfa0c7 100644
--- a/contrib/pyln-spec/bolt1/pyln/spec/bolt1/text.py
+++ b/contrib/pyln-spec/bolt1/pyln/spec/bolt1/text.py
@@ -10,7 +10,7 @@
 
 - Bitcoin mainet with port number 9735 or the corresponding hexadecimal `0x2607`;
 - Bitcoin testnet with port number 19735 (`0x4D17`);
-- Bitcoin signet with port number 39735 (`0xF87`).
+- Bitcoin signet with port number 39735 (`0x9B37`).
 
 The Unicode code point for LIGHTNING <sup>[1](#reference-1)</sup>, and the port convention try to follow the Bitcoin Core convention.