diff --git a/ts/mod_npm/index.ts b/ts/mod_npm/index.ts
index 00a4c44..a5d1b18 100644
--- a/ts/mod_npm/index.ts
+++ b/ts/mod_npm/index.ts
@@ -54,7 +54,7 @@ const prepare = async () => {
 
   plugins.smartfile.memory.toFsSync(npmrcFileString, '/root/.npmrc');
   logger.log('info', `setting default npm registry to ${config.npmRegistryUrl}`);
-  await bash(`npm set registry https:${config.npmRegistryUrl}`);
+  await bash(`npm set registry https://${config.npmRegistryUrl}`);
   return;
 };