diff --git a/tool/gocross/gocross.go b/tool/gocross/gocross.go
index f5131505e..7ac7c7b3e 100644
--- a/tool/gocross/gocross.go
+++ b/tool/gocross/gocross.go
@@ -15,6 +15,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"tailscale.com/atomicfile"
 	"tailscale.com/version"