diff --git a/internal/fs/fs_reader.go b/internal/fs/fs_reader.go
index 84a79168e..9dd5ff6eb 100644
--- a/internal/fs/fs_reader.go
+++ b/internal/fs/fs_reader.go
@@ -237,10 +237,6 @@ func (f fakeFile) Readdirnames(_ int) ([]string, error) {
 	return nil, pathError("readdirnames", f.name, os.ErrInvalid)
 }
 
-func (f fakeFile) Readdir(_ int) ([]os.FileInfo, error) {
-	return nil, pathError("readdir", f.name, os.ErrInvalid)
-}
-
 func (f fakeFile) Seek(int64, int) (int64, error) {
 	return 0, pathError("seek", f.name, os.ErrInvalid)
 }
@@ -279,13 +275,6 @@ func (d fakeDir) Readdirnames(n int) ([]string, error) {
 	return names, nil
 }
 
-func (d fakeDir) Readdir(n int) ([]os.FileInfo, error) {
-	if n > 0 {
-		return nil, pathError("readdir", d.name, errors.New("not implemented"))
-	}
-	return d.entries, nil
-}
-
 // fakeFileInfo implements the bare minimum of os.FileInfo.
 type fakeFileInfo struct {
 	name    string
diff --git a/internal/fs/fs_reader_test.go b/internal/fs/fs_reader_test.go
index 9fa67b5ac..442912fe3 100644
--- a/internal/fs/fs_reader_test.go
+++ b/internal/fs/fs_reader_test.go
@@ -60,77 +60,6 @@ func verifyDirectoryContents(t testing.TB, fs FS, dir string, want []string) {
 	}
 }
 
-type fiSlice []os.FileInfo
-
-func (s fiSlice) Len() int {
-	return len(s)
-}
-
-func (s fiSlice) Less(i, j int) bool {
-	return s[i].Name() < s[j].Name()
-}
-
-func (s fiSlice) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-
-func verifyDirectoryContentsFI(t testing.TB, fs FS, dir string, want []os.FileInfo) {
-	f, err := fs.OpenFile(dir, os.O_RDONLY, 0)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	entries, err := f.Readdir(-1)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	err = f.Close()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	sort.Sort(fiSlice(want))
-	sort.Sort(fiSlice(entries))
-
-	if len(want) != len(entries) {
-		t.Errorf("wrong number of entries returned, want %d, got %d", len(want), len(entries))
-	}
-	max := len(want)
-	if len(entries) < max {
-		max = len(entries)
-	}
-
-	for i := 0; i < max; i++ {
-		fi1 := want[i]
-		fi2 := entries[i]
-
-		if fi1.Name() != fi2.Name() {
-			t.Errorf("entry %d: wrong value for Name: want %q, got %q", i, fi1.Name(), fi2.Name())
-		}
-
-		if fi1.IsDir() != fi2.IsDir() {
-			t.Errorf("entry %d: wrong value for IsDir: want %v, got %v", i, fi1.IsDir(), fi2.IsDir())
-		}
-
-		if fi1.Mode() != fi2.Mode() {
-			t.Errorf("entry %d: wrong value for Mode: want %v, got %v", i, fi1.Mode(), fi2.Mode())
-		}
-
-		if fi1.ModTime() != fi2.ModTime() {
-			t.Errorf("entry %d: wrong value for ModTime: want %v, got %v", i, fi1.ModTime(), fi2.ModTime())
-		}
-
-		if fi1.Size() != fi2.Size() {
-			t.Errorf("entry %d: wrong value for Size: want %v, got %v", i, fi1.Size(), fi2.Size())
-		}
-
-		if fi1.Sys() != fi2.Sys() {
-			t.Errorf("entry %d: wrong value for Sys: want %v, got %v", i, fi1.Sys(), fi2.Sys())
-		}
-	}
-}
-
 func checkFileInfo(t testing.TB, fi os.FileInfo, filename string, modtime time.Time, mode os.FileMode, isdir bool) {
 	if fi.IsDir() != isdir {
 		t.Errorf("IsDir returned %t, want %t", fi.IsDir(), isdir)
@@ -174,30 +103,6 @@ func TestFSReader(t *testing.T) {
 				verifyDirectoryContents(t, fs, ".", []string{filename})
 			},
 		},
-		{
-			name: "Readdir-slash",
-			f: func(t *testing.T, fs FS) {
-				fi := fakeFileInfo{
-					mode:    0644,
-					modtime: now,
-					name:    filename,
-					size:    int64(len(data)),
-				}
-				verifyDirectoryContentsFI(t, fs, "/", []os.FileInfo{fi})
-			},
-		},
-		{
-			name: "Readdir-current",
-			f: func(t *testing.T, fs FS) {
-				fi := fakeFileInfo{
-					mode:    0644,
-					modtime: now,
-					name:    filename,
-					size:    int64(len(data)),
-				}
-				verifyDirectoryContentsFI(t, fs, ".", []os.FileInfo{fi})
-			},
-		},
 		{
 			name: "file/OpenFile",
 			f: func(t *testing.T, fs FS) {
diff --git a/internal/fs/interface.go b/internal/fs/interface.go
index bc6aab44a..7707abd1d 100644
--- a/internal/fs/interface.go
+++ b/internal/fs/interface.go
@@ -31,7 +31,6 @@ type File interface {
 
 	Fd() uintptr
 	Readdirnames(n int) ([]string, error)
-	Readdir(int) ([]os.FileInfo, error)
 	Seek(int64, int) (int64, error)
 	Stat() (os.FileInfo, error)
 	Name() string