diff --git a/main.go b/main.go
index 86cba76..c956185 100644
--- a/main.go
+++ b/main.go
@@ -25,24 +25,8 @@
 //
 package main
 
-import (
-	Main "cmd/go"
-	"go/build"
-	"log"
-)
+import Main "cmd/go"
 
 func main() {
-	checkGoVersion()
-
 	Main.Main()
 }
-
-func checkGoVersion() {
-	for _, tag := range build.Default.ReleaseTags {
-		if tag == "go1.10" {
-			return
-		}
-	}
-	log.SetFlags(0)
-	log.Fatalf("vgo requires Go 1.10")
-}
diff --git a/vendor/cmd/go/internal/cfg/cfg.go b/vendor/cmd/go/internal/cfg/cfg.go
index 56a3427..5093c28 100644
--- a/vendor/cmd/go/internal/cfg/cfg.go
+++ b/vendor/cmd/go/internal/cfg/cfg.go
@@ -11,6 +11,7 @@
 	"fmt"
 	"go/build"
 	"io/ioutil"
+	"log"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -121,6 +122,16 @@
 }
 
 func findGOROOT() string {
+	goroot := findGOROOT1()
+	_, err := os.Stat(filepath.Join(goroot, "api/go1.10.txt"))
+	if err != nil {
+		log.SetFlags(0)
+		log.Fatalf("vgo requires Go 1.10 but VGOROOT=%s is not a Go 1.10 source tree", goroot)
+	}
+	return goroot
+}
+
+func findGOROOT1() string {
 	if env := os.Getenv("VGOROOT"); env != "" {
 		return filepath.Clean(env)
 	}