diff --git a/tasks/apt/sources.yaml b/tasks/apt/sources.yaml
index 77603d8..6dcf004 100644
--- a/tasks/apt/sources.yaml
+++ b/tasks/apt/sources.yaml
@@ -28,7 +28,7 @@
         mode: "0644"
       when:
         - 'ansible_os_family == "Debian"'
-        - "inventory_hostname in group['proxmox']"
+        - "inventory_hostname in groups['proxmox']"
       notify: "apt force cache update"
 
     # configure apt sources