diff --git a/src/util/Constants.js b/src/util/Constants.js
index ed012d8c8..69ad7620f 100644
--- a/src/util/Constants.js
+++ b/src/util/Constants.js
@@ -435,6 +435,7 @@ exports.Colors = {
  * * UNKNOWN_TOKEN
  * * UNKNOWN_USER
  * * UNKNOWN_EMOJI
+ * * UNKNOWN_WEBHOOK
  * * BOT_PROHIBITED_ENDPOINT
  * * BOT_ONLY_ENDPOINT
  * * MAXIMUM_GUILDS
@@ -481,6 +482,7 @@ exports.APIErrors = {
   UNKNOWN_TOKEN: 10012,
   UNKNOWN_USER: 10013,
   UNKNOWN_EMOJI: 10014,
+  UNKNOWN_WEBHOOK: 10015,
   BOT_PROHIBITED_ENDPOINT: 20001,
   BOT_ONLY_ENDPOINT: 20002,
   MAXIMUM_GUILDS: 30001,
diff --git a/typings/index.d.ts b/typings/index.d.ts
index e4887937e..b678c5a2c 100644
--- a/typings/index.d.ts
+++ b/typings/index.d.ts
@@ -1380,6 +1380,7 @@ declare module 'discord.js' {
 		UNKNOWN_TOKEN: number;
 		UNKNOWN_USER: number;
 		UNKNOWN_EMOJI: number;
+		UNKNOWN_WEBHOOK: number;
 		BOT_PROHIBITED_ENDPOINT: number;
 		BOT_ONLY_ENDPOINT: number;
 		MAXIMUM_GUILDS: number;