Malformed version for linux kernel

when trying to create a newVersion for the amazon1/2 (and other distros) kernel version (output of uname -r) it reports a Malformed version.
for example: 4.14.77-70.59.amzn1.x86_64
A short investigation shows that the "_" in the x86_64 is the problem.

A short code to reproduce it:
package main

import (
"fmt"
version "github.com/hashicorp/go-version"
)

func main() {
v1, err := version.NewVersion("4.4.23-31.54.amzn1.x86_64")
if err != nil {
fmt.Printf("Error %v\n", err)
return
} else {
fmt.Printf("Got version %v\n", v1)
}
}