diff --git a/test/nosplit.go b/test/nosplit.go
index 46810b1a2f8..266e6077b1f 100644
--- a/test/nosplit.go
+++ b/test/nosplit.go
@@ -217,6 +217,7 @@ func main() {
 		return
 	}
 	defer os.RemoveAll(dir)
+	os.Setenv("GOPATH", filepath.Join(dir, "_gopath"))
 
 	if err := ioutil.WriteFile(filepath.Join(dir, "go.mod"), []byte("module go-test-nosplit\n"), 0666); err != nil {
 		log.Panic(err)