diff --git a/deno/rest/common.ts b/deno/rest/common.ts
index c115e8c01..212ffc18b 100644
--- a/deno/rest/common.ts
+++ b/deno/rest/common.ts
@@ -179,6 +179,8 @@ export enum RESTJSONErrorCodes {
 	InvalidFormBodyOrContentType,
 	InviteAcceptedToGuildWithoutTheBotBeingIn,
 
+	InvalidActivityAction = 50039,
+
 	InvalidAPIVersion = 50041,
 
 	FileUploadedExceedsMaximumSize = 50045,
diff --git a/rest/common.ts b/rest/common.ts
index c115e8c01..212ffc18b 100644
--- a/rest/common.ts
+++ b/rest/common.ts
@@ -179,6 +179,8 @@ export enum RESTJSONErrorCodes {
 	InvalidFormBodyOrContentType,
 	InviteAcceptedToGuildWithoutTheBotBeingIn,
 
+	InvalidActivityAction = 50039,
+
 	InvalidAPIVersion = 50041,
 
 	FileUploadedExceedsMaximumSize = 50045,