diff --git a/packages/translators/DeepLTranslator.ts b/packages/translators/DeepLTranslator.ts
index 4c077a87..f4b6f918 100644
--- a/packages/translators/DeepLTranslator.ts
+++ b/packages/translators/DeepLTranslator.ts
@@ -32,7 +32,7 @@ export class DeepLTranslator implements DittoTranslator {
     source: LanguageCode | undefined,
     dest: LanguageCode,
     opts?: { signal?: AbortSignal },
-  ) {
+  ): Promise<{ results: string[]; source_lang: LanguageCode }> {
     const { translations } = await this.translateMany(texts, source, dest, opts);
 
     return {
diff --git a/packages/translators/LibreTranslateTranslator.ts b/packages/translators/LibreTranslateTranslator.ts
index 041a0ee7..b75f9b54 100644
--- a/packages/translators/LibreTranslateTranslator.ts
+++ b/packages/translators/LibreTranslateTranslator.ts
@@ -32,7 +32,7 @@ export class LibreTranslateTranslator implements DittoTranslator {
     source: LanguageCode | undefined,
     dest: LanguageCode,
     opts?: { signal?: AbortSignal },
-  ) {
+  ): Promise<{ results: string[]; source_lang: LanguageCode }> {
     const translations = await Promise.all(
       texts.map((text) => this.translateOne(text, source, dest, 'html', { signal: opts?.signal })),
     );