diff --git a/src/runtime/arch_mips64.go b/src/runtime/arch_mips64.go
deleted file mode 100644
index dff830fe98..0000000000
--- a/src/runtime/arch_mips64.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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.
-
-package runtime
-
-const (
-	thechar        = '0'
-	_BigEndian     = 1
-	_CacheLineSize = 32
-	_PhysPageSize  = 16384
-	_PCQuantum     = 4
-	_Int64Align    = 8
-	hugePageSize   = 0
-	minFrameSize   = 8
-)
-
-type uintreg uint64
-type intptr int64 // TODO(rsc): remove
diff --git a/src/runtime/arch_mips64le.go b/src/runtime/arch_mips64le.go
deleted file mode 100644
index bc4b73f0ff..0000000000
--- a/src/runtime/arch_mips64le.go
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 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.
-
-package runtime
-
-const (
-	thechar        = '0'
-	_BigEndian     = 0
-	_CacheLineSize = 32
-	_PhysPageSize  = 16384
-	_PCQuantum     = 4
-	_Int64Align    = 8
-	hugePageSize   = 0
-	minFrameSize   = 8
-)
-
-type uintreg uint64
-type intptr int64 // TODO(rsc): remove
diff --git a/src/runtime/internal/sys/arch_mips64.go b/src/runtime/internal/sys/arch_mips64.go
new file mode 100644
index 0000000000..6fa0f5ee74
--- /dev/null
+++ b/src/runtime/internal/sys/arch_mips64.go
@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+package sys
+
+const (
+	TheChar       = '0'
+	BigEndian     = 1
+	CacheLineSize = 32
+	PhysPageSize  = 16384
+	PCQuantum     = 4
+	Int64Align    = 8
+	HugePageSize  = 0
+	MinFrameSize  = 8
+)
+
+type Uintreg uint64
+type Intptr int64 // TODO(rsc): remove
diff --git a/src/runtime/internal/sys/arch_mips64le.go b/src/runtime/internal/sys/arch_mips64le.go
new file mode 100644
index 0000000000..92b35ad65b
--- /dev/null
+++ b/src/runtime/internal/sys/arch_mips64le.go
@@ -0,0 +1,19 @@
+// Copyright 2015 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.
+
+package sys
+
+const (
+	TheChar       = '0'
+	BigEndian     = 0
+	CacheLineSize = 32
+	PhysPageSize  = 16384
+	PCQuantum     = 4
+	Int64Align    = 8
+	HugePageSize  = 0
+	MinFrameSize  = 8
+)
+
+type Uintreg uint64
+type Intptr int64 // TODO(rsc): remove