diff --git a/context.ts b/context.ts
index 8b6c727..241fe06 100644
--- a/context.ts
+++ b/context.ts
@@ -1,12 +1,11 @@
 // Copyright 2023 Samuel Kopp. All rights reserved. Apache-2.0 license.
+/// <reference types='./env.d.ts' />
 import { ZodType } from 'https://deno.land/x/zod@v3.21.4/types.ts'
 import { AppContext } from './cheetah.ts'
 import { ObjectType, Payload } from './handler.ts'
 import { RequestContext } from './request_context.ts'
 import { ResponseContext } from './response_context.ts'
 
-type Variables = Record<string, unknown>
-
 const HTTP_MESSAGES = {
   'Bad Request': 400,
   'Unauthorized': 401,
diff --git a/env.d.ts b/env.d.ts
new file mode 100644
index 0000000..285808e
--- /dev/null
+++ b/env.d.ts
@@ -0,0 +1,5 @@
+declare global {
+  type Variables = Record<string, unknown>
+}
+
+export {}