diff --git a/nixos/modules/misc/ids.nix b/nixos/modules/misc/ids.nix
index 3bb7fdb9b2d..df82bc8b890 100644
--- a/nixos/modules/misc/ids.nix
+++ b/nixos/modules/misc/ids.nix
@@ -310,6 +310,7 @@
       kubernetes = 158;
       fleet = 159;
       gitlab = 160;
+      btsync = 161;
 
       # When adding a gid, make sure it doesn't match an existing uid. And don't use gids above 399!