diff --git a/dashboard/builder/env.go b/dashboard/builder/env.go
index b97db998..199e4e6d 100644
--- a/dashboard/builder/env.go
+++ b/dashboard/builder/env.go
@@ -125,8 +125,12 @@ func (env *goEnv) setup(repo *Repo, workpath, hash string, envv []string) (strin
 	if err := repo.Export(goworkpath, hash); err != nil {
 		return "", fmt.Errorf("error exporting repository: %s", err)
 	}
-	if err := ioutil.WriteFile(filepath.Join(goworkpath, "VERSION"), []byte(hash), 0644); err != nil {
-		return "", fmt.Errorf("error writing VERSION file: %s", err)
+	// Write out VERSION file if it does not already exist.
+	vFile := filepath.Join(goworkpath, "VERSION")
+	if _, err := os.Stat(vFile); os.IsNotExist(err) {
+		if err := ioutil.WriteFile(vFile, []byte(hash), 0644); err != nil {
+			return "", fmt.Errorf("error writing VERSION file: %s", err)
+		}
 	}
 	return filepath.Join(goworkpath, "src"), nil
 }