diff --git a/nixos/modules/services/networking/znc/options.nix b/nixos/modules/services/networking/znc/options.nix
index 505ebb3bf0a..29d16e20318 100644
--- a/nixos/modules/services/networking/znc/options.nix
+++ b/nixos/modules/services/networking/znc/options.nix
@@ -254,8 +254,9 @@ in
             listToAttrs (map (n: nameValuePair "#${n}" (mkDefault {})) net.channels);
           extraConfig = if net.extraConf == "" then mkDefault null else net.extraConf;
         }) c.networks;
-        extraConfig = [ c.passBlock ] ++ optional (c.extraZncConf != "") c.extraZncConf;
+        extraConfig = [ c.passBlock ];
       };
+      extraConfig = optional (c.extraZncConf != "") c.extraZncConf;
     };
   };