diff --git a/internal/fs/fs_reader.go b/internal/fs/fs_reader.go
index 91fedb263..d991951aa 100644
--- a/internal/fs/fs_reader.go
+++ b/internal/fs/fs_reader.go
@@ -252,10 +252,6 @@ func (f fakeFile) Seek(int64, int) (int64, error) {
 	return 0, os.ErrInvalid
 }
 
-func (f fakeFile) Write(p []byte) (int, error) {
-	return 0, os.ErrInvalid
-}
-
 func (f fakeFile) Read(p []byte) (int, error) {
 	return 0, os.ErrInvalid
 }
diff --git a/internal/fs/helpers.go b/internal/fs/helpers.go
index 7ce24afe9..b7f7ad6ba 100644
--- a/internal/fs/helpers.go
+++ b/internal/fs/helpers.go
@@ -1,10 +1,6 @@
 package fs
 
-import (
-	"io/ioutil"
-	"os"
-	"testing"
-)
+import "os"
 
 // IsRegularFile returns true if fi belongs to a normal file. If fi is nil,
 // false is returned.
@@ -15,22 +11,3 @@ func IsRegularFile(fi os.FileInfo) bool {
 
 	return fi.Mode()&(os.ModeType|os.ModeCharDevice) == 0
 }
-
-// TestTempFile returns a new temporary file, which is removed when cleanup()
-// is called.
-func TestTempFile(t testing.TB, prefix string) (File, func()) {
-	f, err := ioutil.TempFile("", prefix)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	cleanup := func() {
-		_ = f.Close()
-		err = Remove(f.Name())
-		if err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	return f, cleanup
-}
diff --git a/internal/fs/interface.go b/internal/fs/interface.go
index 1c2260215..b26c56944 100644
--- a/internal/fs/interface.go
+++ b/internal/fs/interface.go
@@ -26,7 +26,6 @@ type FS interface {
 // File is an open file on a file system.
 type File interface {
 	io.Reader
-	io.Writer
 	io.Closer
 
 	Fd() uintptr
diff --git a/internal/textfile/read_test.go b/internal/textfile/read_test.go
index 572a33ebe..8e8e659dc 100644
--- a/internal/textfile/read_test.go
+++ b/internal/textfile/read_test.go
@@ -3,25 +3,44 @@ package textfile
 import (
 	"bytes"
 	"encoding/hex"
+	"io/ioutil"
+	"os"
 	"testing"
-
-	"github.com/restic/restic/internal/fs"
 )
 
-func writeTempfile(t testing.TB, data []byte) (fs.File, func()) {
-	f, removeTempfile := fs.TestTempFile(t, "restic-test-textfile-read-")
+// writeTempfile writes data to a new temporary file and returns its name
+// and a callback that removes it.
+func writeTempfile(t testing.TB, data []byte) (string, func()) {
+	t.Helper()
 
-	_, err := f.Write(data)
+	f, err := ioutil.TempFile("", "restic-test-textfile-read-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	name := f.Name()
+
+	defer func() {
+		closeErr := f.Close()
+		if err == nil && closeErr != nil {
+			err = closeErr
+		}
+		if err != nil {
+			os.Remove(name)
+			t.Fatal(err)
+		}
+	}()
+
+	_, err = f.Write(data)
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	err = f.Close()
-	if err != nil {
-		t.Fatal(err)
+	return name, func() {
+		err := os.Remove(name)
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
-
-	return f, removeTempfile
 }
 
 func dec(s string) []byte {
@@ -60,10 +79,10 @@ func TestRead(t *testing.T) {
 				want = test.data
 			}
 
-			f, cleanup := writeTempfile(t, test.data)
+			tempname, cleanup := writeTempfile(t, test.data)
 			defer cleanup()
 
-			data, err := Read(f.Name())
+			data, err := Read(tempname)
 			if err != nil {
 				t.Fatal(err)
 			}