diff --git a/appdefs.yml b/appdefs.yml
index 003591d..a62a132 100644
--- a/appdefs.yml
+++ b/appdefs.yml
@@ -12,6 +12,7 @@ app:
   name: firefox
   friendly_name: Firefox
   gui_type: x11
+  base_os: alpine
   project:
     description: |-
       Mozilla Firefox is a free and open-source web browser developed by Mozilla