diff --git a/server/middlewares/validators/videos/video-captions.ts b/server/middlewares/validators/videos/video-captions.ts
index 2946f3e15..6bc127e01 100644
--- a/server/middlewares/validators/videos/video-captions.ts
+++ b/server/middlewares/validators/videos/video-captions.ts
@@ -17,7 +17,8 @@ const addVideoCaptionValidator = [
     .custom((_, { req }) => isVideoCaptionFile(req.files, 'captionfile'))
     .withMessage(
       'This caption file is not supported or too large. ' +
-      `Please, make sure it is under ${CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.FILE_SIZE} and one of the following mimetypes: ` +
+      `Please, make sure it is under ${CONSTRAINTS_FIELDS.VIDEO_CAPTIONS.CAPTION_FILE.FILE_SIZE.max} bytes ` +
+      'and one of the following mimetypes: ' +
       Object.keys(MIMETYPES.VIDEO_CAPTIONS.MIMETYPE_EXT).map(key => `${key} (${MIMETYPES.VIDEO_CAPTIONS.MIMETYPE_EXT[key]})`).join(', ')
     ),