diff --git a/src/os/dir_unix.go b/src/os/dir_unix.go
index 266a78acaf..1e8d1d0a30 100644
--- a/src/os/dir_unix.go
+++ b/src/os/dir_unix.go
@@ -7,6 +7,7 @@
 package os
 
 import (
+	"internal/goarch"
 	"io"
 	"runtime"
 	"sync"
@@ -153,7 +154,7 @@ func readInt(b []byte, off, size uintptr) (u uint64, ok bool) {
 	if len(b) < int(off+size) {
 		return 0, false
 	}
-	if isBigEndian {
+	if goarch.BigEndian {
 		return readIntBE(b[off:], size), true
 	}
 	return readIntLE(b[off:], size), true
diff --git a/src/os/endian_big.go b/src/os/endian_big.go
deleted file mode 100644
index 0375e53372..0000000000
--- a/src/os/endian_big.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-//
-//go:build ppc64 || s390x || mips || mips64
-
-package os
-
-const isBigEndian = true
diff --git a/src/os/endian_little.go b/src/os/endian_little.go
deleted file mode 100644
index a7cf1cdda8..0000000000
--- a/src/os/endian_little.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-//
-//go:build 386 || amd64 || arm || arm64 || loong64 || ppc64le || mips64le || mipsle || riscv64 || wasm
-
-package os
-
-const isBigEndian = false