diff --git a/templates/cli/lib/client.js.twig b/templates/cli/lib/client.js.twig
index 082b4de09..a7457ffdc 100644
--- a/templates/cli/lib/client.js.twig
+++ b/templates/cli/lib/client.js.twig
@@ -1,4 +1,5 @@
 const os = require('os');
+const join = require('path').join;
 const https = require("https");
 const { fetch, FormData, Agent } = require("undici");
 const JSONbig = require("json-bigint")({ storeAsString: false });
@@ -96,7 +97,7 @@ class Client {
 
   async call(method, path = "", headers = {}, params = {}, responseType = "json") {
     headers = {...this.headers, ...headers};
-    const url = new URL(this.endpoint + path);
+    const url = new URL(join(this.endpoint + path));
 
     let body = undefined;