diff --git a/nixos/modules/services/continuous-integration/buildbot/master.nix b/nixos/modules/services/continuous-integration/buildbot/master.nix
index f363822c21c..0ff6dbac39c 100644
--- a/nixos/modules/services/continuous-integration/buildbot/master.nix
+++ b/nixos/modules/services/continuous-integration/buildbot/master.nix
@@ -118,7 +118,7 @@ in {
 
       extraGroups = mkOption {
         type = types.listOf types.str;
-        default = [ "nixbld" ];
+        default = [];
         description = "List of extra groups that the buildbot user should be a part of.";
       };
 
diff --git a/nixos/modules/services/continuous-integration/buildbot/worker.nix b/nixos/modules/services/continuous-integration/buildbot/worker.nix
index e80869573fa..00423bd3386 100644
--- a/nixos/modules/services/continuous-integration/buildbot/worker.nix
+++ b/nixos/modules/services/continuous-integration/buildbot/worker.nix
@@ -31,7 +31,7 @@ in {
 
       extraGroups = mkOption {
         type = types.listOf types.str;
-        default = [ "nixbld" ];
+        default = [];
         description = "List of extra groups that the Buildbot Worker user should be a part of.";
       };