diff --git a/internal/runtime/cpu.go b/internal/runtime/cpu_linux.go
similarity index 99%
rename from internal/runtime/cpu.go
rename to internal/runtime/cpu_linux.go
index f2f9377c6..41b969df1 100644
--- a/internal/runtime/cpu.go
+++ b/internal/runtime/cpu_linux.go
@@ -1,3 +1,5 @@
+// +build linux
+
 /*
 Copyright 2018 The Kubernetes Authors.
 
diff --git a/internal/runtime/cpu_notlinux.go b/internal/runtime/cpu_notlinux.go
new file mode 100644
index 000000000..86a649e62
--- /dev/null
+++ b/internal/runtime/cpu_notlinux.go
@@ -0,0 +1,28 @@
+// +build !linux
+
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package runtime
+
+import (
+	"runtime"
+)
+
+// NumCPU ...
+func NumCPU() int {
+	return runtime.NumCPU()
+}