diff --git a/nixos/modules/programs/nncp.nix b/nixos/modules/programs/nncp.nix
index 6ac0363e50a0..08485f0dfc87 100644
--- a/nixos/modules/programs/nncp.nix
+++ b/nixos/modules/programs/nncp.nix
@@ -79,7 +79,7 @@ in {
         for f in ${jsonCfgFile} ${builtins.toString config.programs.nncp.secrets}
         do
           ${lib.getExe pkgs.hjson-go} -c <"$f"
-        done |${lib.getExe pkgs.jq} --slurp add >${nncpCfgFile}
+        done |${lib.getExe pkgs.jq} --slurp 'reduce .[] as $x ({}; . * $x)' >${nncpCfgFile}
         chgrp ${programCfg.group} ${nncpCfgFile}
       '';
     };