diff --git a/src/application/validation/allowed-mime-types.ts b/src/application/validation/allowed-mime-types.ts
index d737a6f..d58ec55 100644
--- a/src/application/validation/allowed-mime-types.ts
+++ b/src/application/validation/allowed-mime-types.ts
@@ -1,8 +1,9 @@
 import { InvalidMimeTypeError } from '@/application/errors'
+import { Validator } from '@/application/validation'
 
 export type Extension = 'png' | 'jpg'
 
-export class AllowedMimeTypes {
+export class AllowedMimeTypes implements Validator {
   constructor (
     private readonly allowed: Extension[],
     private readonly mimeType: string
diff --git a/src/application/validation/max-file-size.ts b/src/application/validation/max-file-size.ts
index 431bbe6..ed8f83b 100644
--- a/src/application/validation/max-file-size.ts
+++ b/src/application/validation/max-file-size.ts
@@ -1,6 +1,7 @@
 import { MaxFileSizeError } from '@/application/errors'
+import { Validator } from '@/application/validation'
 
-export class MaxFileSize {
+export class MaxFileSize implements Validator {
   constructor (
     private readonly maxSizeInMb: number,
     private readonly value: Buffer