diff --git a/src/hono-base.ts b/src/hono-base.ts
index 3e040da53..c141a0db6 100644
--- a/src/hono-base.ts
+++ b/src/hono-base.ts
@@ -26,13 +26,9 @@ import type {
   RouterRoute,
   Schema,
 } from './types'
+import { COMPOSED_HANDLER } from './utils/constants'
 import { getPath, getPathNoStrict, mergePath } from './utils/url'
 
-/**
- * Symbol used to mark a composed handler.
- */
-export const COMPOSED_HANDLER = Symbol('composedHandler')
-
 const notFoundHandler = (c: Context) => {
   return c.text('404 Not Found', 404)
 }
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
new file mode 100644
index 000000000..27d04ea36
--- /dev/null
+++ b/src/utils/constants.ts
@@ -0,0 +1,4 @@
+/**
+ * Constant used to mark a composed handler.
+ */
+export const COMPOSED_HANDLER = '__COMPOSED_HANDLER'
diff --git a/src/utils/handler.ts b/src/utils/handler.ts
index bdf4d7d58..295496870 100644
--- a/src/utils/handler.ts
+++ b/src/utils/handler.ts
@@ -3,7 +3,7 @@
  * Handler utility.
  */
 
-import { COMPOSED_HANDLER } from '../hono-base'
+import { COMPOSED_HANDLER } from './constants'
 
 export const isMiddleware = (handler: Function) => handler.length > 1
 export const findTargetHandler = (handler: Function): Function => {