diff --git a/scripts/FileSystem.ts b/scripts/FileSystem.ts
index b83d52ab8..4716619b8 100644
--- a/scripts/FileSystem.ts
+++ b/scripts/FileSystem.ts
@@ -13,7 +13,7 @@ export interface FileSystem {
   readonly moveFile: (from: string, to: string) => TE.TaskEither<Error, void>
 }
 
-const readFile = TE.taskify<fs.PathLike, string, NodeJS.ErrnoException, string>(fs.readFile)
+const readFile = TE.taskify<fs.PathLike, { readonly encoding: 'utf8' }, NodeJS.ErrnoException, string>(fs.readFile)
 const writeFile = TE.taskify<fs.PathLike, string, NodeJS.ErrnoException, void>(fs.writeFile)
 const copyFile = TE.taskify<fs.PathLike, fs.PathLike, NodeJS.ErrnoException, void>(fs.copyFile)
 const glob = TE.taskify<string, Error, ReadonlyArray<string>>(G)
@@ -21,7 +21,7 @@ const mkdirTE = TE.taskify(fs.mkdir)
 const moveFile = TE.taskify<fs.PathLike, fs.PathLike, NodeJS.ErrnoException, void>(fs.rename)
 
 export const fileSystem: FileSystem = {
-  readFile: (path) => readFile(path, 'utf8'),
+  readFile: (path) => readFile(path, { encoding: 'utf8' }),
   writeFile,
   copyFile,
   glob,