1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/home-automation/home-assistant.nix b/nixos/modules/services/home-automation/home-assistant.nix
index 6adc58ec58ec..cea8a2b14cc2 100644
--- a/nixos/modules/services/home-automation/home-assistant.nix
+++ b/nixos/modules/services/home-automation/home-assistant.nix
@@ -362,7 +362,7 @@ in {
   config = mkIf cfg.enable {
     assertions = [
       {
-        assertion = cfg.openFirewall -> !isNull cfg.config;
+        assertion = cfg.openFirewall -> cfg.config != null;
         message = "openFirewall can only be used with a declarative config";
       }
     ];