diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index ba816f523..5513ddc49 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -17,6 +17,7 @@
 
 - [Backups] Delete unused snapshots related to other schedules (even no longer existing) (PR [#5949](https://github.com/vatesfr/xen-orchestra/pull/5949))
 - [Jobs] Fix `job.runSequence` method (PR [#5944](https://github.com/vatesfr/xen-orchestra/pull/5944))
+- [Netbox] Fix error when testing plugin on versions older than 2.10 (PR [#5963](https://github.com/vatesfr/xen-orchestra/pull/5963))
 
 ### Packages to release
 
@@ -35,6 +36,7 @@
 >
 > In case of conflict, the highest (lowest in previous list) `$version` wins.
 
+- xo-server-netbox patch
 - vhd-lib minor
 - @xen-orchestra/backup minor
 - @xen-orchestra/proxy minor
diff --git a/packages/xo-server-netbox/src/index.js b/packages/xo-server-netbox/src/index.js
index 3bd5fbae5..77a822c90 100644
--- a/packages/xo-server-netbox/src/index.js
+++ b/packages/xo-server-netbox/src/index.js
@@ -662,7 +662,7 @@ class Netbox {
   }
 
   async test() {
-    const randomSuffix = Math.random().toString(36).slice(2)
+    const randomSuffix = Math.random().toString(36).slice(2, 11)
     const name = '[TMP] Xen Orchestra Netbox plugin test - ' + randomSuffix
     await this.#makeRequest('/virtualization/cluster-types/', 'POST', {
       name,