diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index 98c797447..58dee08c4 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -12,6 +12,7 @@
 > Users must be able to say: “I had this issue, happy to know it's fixed”
 
 - [Dashboard/Health] Fix `Unknown SR` and `Unknown VDI` in Unhealthy VDIs (PR [#6519](https://github.com/vatesfr/xen-orchestra/pull/6519))
+- [Proxies] Fix `this.getObject is not a function` on upgrade
 
 ### Packages to release
 
diff --git a/packages/xo-server/src/xo-mixins/proxies.mjs b/packages/xo-server/src/xo-mixins/proxies.mjs
index f311a743b..956762c72 100644
--- a/packages/xo-server/src/xo-mixins/proxies.mjs
+++ b/packages/xo-server/src/xo-mixins/proxies.mjs
@@ -200,7 +200,7 @@ export default class Proxy {
     const { vmUuid } = await this._getProxy(id)
     if (vmUuid !== undefined) {
       try {
-        this.getObject(vmUuid, 'VM')
+        this._app.getObject(vmUuid, 'VM')
 
         isVmKnown = true
       } catch (error) {