diff --git a/src/runtime/os2_linux.go b/src/runtime/os2_linux_generic.go
similarity index 90%
rename from src/runtime/os2_linux.go
rename to src/runtime/os2_linux_generic.go
index 71f36ebeff..01e6c8a5ec 100644
--- a/src/runtime/os2_linux.go
+++ b/src/runtime/os2_linux_generic.go
@@ -2,6 +2,10 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build !mips64
+// +build !mips64le
+// +build linux
+
 package runtime
 
 const (
diff --git a/src/runtime/os2_linux_mips64x.go b/src/runtime/os2_linux_mips64x.go
new file mode 100644
index 0000000000..9a6a92a87d
--- /dev/null
+++ b/src/runtime/os2_linux_mips64x.go
@@ -0,0 +1,25 @@
+// 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.
+
+// +build linux
+// +build mips64 mips64le
+
+package runtime
+
+const (
+	_SS_DISABLE  = 2
+	_NSIG        = 65
+	_SI_USER     = 0
+	_SIG_BLOCK   = 1
+	_SIG_UNBLOCK = 2
+	_SIG_SETMASK = 3
+	_RLIMIT_AS   = 6
+)
+
+type sigset [2]uint64
+
+type rlimit struct {
+	rlim_cur uintptr
+	rlim_max uintptr
+}