diff --git a/modules/examples/ofborg.nix b/modules/examples/ofborg.nix
index 6cef6e79..ed928b73 100644
--- a/modules/examples/ofborg.nix
+++ b/modules/examples/ofborg.nix
@@ -18,11 +18,6 @@ with lib;
   nix.gc.automatic = true;
   nix.gc.options = "--max-freed $((25 * 1024**3 - 1024 * $(df -P -k /nix/store | tail -n 1 | awk '{ print $4 }')))";
 
-  # Manage user for ofborg, this enables creating/deleting users
-  # depending on what modules are enabled.
-  users.knownGroups = [ "ofborg" ];
-  users.knownUsers = [ "ofborg" ];
-
   # Used for backwards compatibility, please read the changelog before changing.
   # $ darwin-rebuild changelog
   system.stateVersion = 5;
diff --git a/modules/services/ofborg/default.nix b/modules/services/ofborg/default.nix
index 4c356158..8959cc84 100644
--- a/modules/services/ofborg/default.nix
+++ b/modules/services/ofborg/default.nix
@@ -46,12 +46,6 @@ in
   };
 
   config = mkIf cfg.enable {
-
-    assertions = [
-      { assertion = elem "ofborg" config.users.knownGroups; message = "set users.knownGroups to enable ofborg group"; }
-      { assertion = elem "ofborg" config.users.knownUsers; message = "set users.knownUsers to enable ofborg user"; }
-    ];
-
     warnings = mkIf (isDerivation cfg.configFile) [
       "services.ofborg.configFile is a derivation, credentials will be world readable"
     ];
@@ -87,9 +81,13 @@ in
     users.users.ofborg.shell = "/bin/bash";
     users.users.ofborg.description = "OfBorg service user";
 
+    users.knownUsers = [ "ofborg" ];
+
     users.groups.ofborg.gid = mkDefault 531;
     users.groups.ofborg.description = "Nix group for OfBorg service";
 
+    users.knownGroups = [ "ofborg" ];
+
     # FIXME: create logfiles automatically if defined.
     system.activationScripts.preActivation.text = ''
       mkdir -p '${user.home}'