diff --git a/.changeset/lemon-rats-pull.md b/.changeset/lemon-rats-pull.md
new file mode 100644
index 00000000..8df2e8d0
--- /dev/null
+++ b/.changeset/lemon-rats-pull.md
@@ -0,0 +1,5 @@
+---
+'@hono/swagger-editor': patch
+---
+
+Add explicit `MiddlewareHandler` return type
diff --git a/packages/swagger-editor/src/index.ts b/packages/swagger-editor/src/index.ts
index 326fc7f7..86f48f5b 100644
--- a/packages/swagger-editor/src/index.ts
+++ b/packages/swagger-editor/src/index.ts
@@ -1,4 +1,4 @@
-import type { Context } from 'hono'
+import type { Context, MiddlewareHandler } from 'hono'
 import type { CustomSwaggerUIOptions } from './types'
 
 const DEFAULT_VERSION = '4.13.1'
@@ -136,7 +136,7 @@ export interface SwaggerEditorOptions extends CustomSwaggerUIOptions {
   version?: string
 }
 
-export function swaggerEditor(options: SwaggerEditorOptions = {}) {
+export function swaggerEditor(options: SwaggerEditorOptions = {}): MiddlewareHandler {
   const url = getUrl()
 
   options.layout = 'StandaloneLayout'
diff --git a/packages/swagger-editor/tsconfig.build.json b/packages/swagger-editor/tsconfig.build.json
index ccc2f65a..a82a1266 100644
--- a/packages/swagger-editor/tsconfig.build.json
+++ b/packages/swagger-editor/tsconfig.build.json
@@ -4,7 +4,8 @@
     "rootDir": "src",
     "outDir": "dist",
     "tsBuildInfoFile": "dist/tsconfig.build.tsbuildinfo",
-    "emitDeclarationOnly": false
+    "emitDeclarationOnly": false,
+    "isolatedDeclarations": true
   },
   "include": ["src/**/*.ts"],
   "exclude": ["**/*.test.ts"],