diff --git a/src/translators/DeepLTranslator.ts b/src/translators/DeepLTranslator.ts
index 5c457903..f30d414a 100644
--- a/src/translators/DeepLTranslator.ts
+++ b/src/translators/DeepLTranslator.ts
@@ -1,6 +1,7 @@
+import { LanguageCode } from 'iso-639-1';
 import { z } from 'zod';
 
-import { DittoTranslator, Provider, SourceLanguage, TargetLanguage } from '@/translators/translator.ts';
+import { DittoTranslator, SourceLanguage, TargetLanguage } from '@/translators/translator.ts';
 import { languageSchema } from '@/schema.ts';
 
 interface DeepLTranslatorOpts {
@@ -16,7 +17,7 @@ export class DeepLTranslator implements DittoTranslator {
   private readonly endpoint: string;
   private readonly apiKey: string;
   private readonly fetch: typeof fetch;
-  private static provider: Provider = 'DeepL.com';
+  private static provider = 'DeepL.com';
 
   constructor(opts: DeepLTranslatorOpts) {
     this.endpoint = opts.endpoint ?? 'https://api.deepl.com';
@@ -34,7 +35,7 @@ export class DeepLTranslator implements DittoTranslator {
 
     return {
       results: data.map((value) => value.text),
-      source_lang: data[0].detected_source_language,
+      source_lang: data[0].detected_source_language as LanguageCode,
     };
   }
 
@@ -90,7 +91,7 @@ export class DeepLTranslator implements DittoTranslator {
   }
 
   /** DeepL provider. */
-  getProvider(): Provider {
+  getProvider(): string {
     return DeepLTranslator.provider;
   }
 }
diff --git a/src/translators/LibreTranslateTranslator.ts b/src/translators/LibreTranslateTranslator.ts
index a7d4eb85..2c201575 100644
--- a/src/translators/LibreTranslateTranslator.ts
+++ b/src/translators/LibreTranslateTranslator.ts
@@ -1,7 +1,7 @@
 import { LanguageCode } from 'iso-639-1';
 import { z } from 'zod';
 
-import { DittoTranslator, Provider, SourceLanguage, TargetLanguage } from '@/translators/translator.ts';
+import { DittoTranslator, SourceLanguage, TargetLanguage } from '@/translators/translator.ts';
 import { languageSchema } from '@/schema.ts';
 
 interface LibreTranslateTranslatorOpts {
@@ -17,7 +17,7 @@ export class LibreTranslateTranslator implements DittoTranslator {
   private readonly endpoint: string;
   private readonly apiKey: string;
   private readonly fetch: typeof fetch;
-  private static provider: Provider = 'libretranslate.com';
+  private static provider = 'libretranslate.com';
 
   constructor(opts: LibreTranslateTranslatorOpts) {
     this.endpoint = opts.endpoint ?? 'https://libretranslate.com';
@@ -37,7 +37,7 @@ export class LibreTranslateTranslator implements DittoTranslator {
 
     return {
       results: translations.map((value) => value.translatedText),
-      source_lang: translations[0]?.detectedLanguage?.language ?? source as LanguageCode, // cast is ok
+      source_lang: (translations[0]?.detectedLanguage?.language ?? source) as LanguageCode, // cast is ok
     };
   }
 
@@ -89,7 +89,7 @@ export class LibreTranslateTranslator implements DittoTranslator {
   }
 
   /** LibreTranslate provider. */
-  getProvider(): Provider {
+  getProvider(): string {
     return LibreTranslateTranslator.provider;
   }
 }
diff --git a/src/translators/translator.ts b/src/translators/translator.ts
index 29874964..98adf5ee 100644
--- a/src/translators/translator.ts
+++ b/src/translators/translator.ts
@@ -3,9 +3,6 @@ import { LRUCache } from 'lru-cache';
 
 import { Time } from '@/utils/time.ts';
 
-/** Supported providers. */
-export type Provider = 'DeepL.com' | 'libretranslate.com';
-
 /** Original language of the post */
 export type SourceLanguage = LanguageCode;
 
@@ -29,7 +26,7 @@ export type MastodonTranslation = {
   //** The language of the source text, as auto-detected by the machine translation provider. */
   detected_source_language: SourceLanguage;
   /** The service that provided the machine translation. */
-  provider: Provider;
+  provider: string;
 };
 
 /** DittoTranslator class, used for status translation. */
@@ -44,7 +41,7 @@ export interface DittoTranslator {
     /** Custom options. */
     opts?: { signal?: AbortSignal },
   ): Promise<{ results: string[]; source_lang: SourceLanguage }>;
-  getProvider(): Provider;
+  getProvider(): string;
 }
 
 /** Includes the TARGET language and the status id.