diff --git a/specification/_types/common.ts b/specification/_types/common.ts
index b5e02a3031..16471ef772 100644
--- a/specification/_types/common.ts
+++ b/specification/_types/common.ts
@@ -49,7 +49,7 @@ export type Uri = string
 export type ScrollId = string
 export type ScrollIds = ScrollId | ScrollId[]
 
-export type CategoryId = string
+export type CategoryId = long
 export type ActionIds = string // TODO: check if this should be an array of ActionId
 
 export type Id = string