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-rw-r--r--nixos/modules/services/networking/ntopng.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/modules/services/networking/ntopng.nix b/nixos/modules/services/networking/ntopng.nix
index e6344d7ff3b3..bf7ec19f02a6 100644
--- a/nixos/modules/services/networking/ntopng.nix
+++ b/nixos/modules/services/networking/ntopng.nix
@@ -86,7 +86,7 @@ in
 
       redis.createInstance = mkOption {
         type = types.nullOr types.str;
-        default = if versionAtLeast config.system.stateVersion "22.05" then "ntopng" else "";
+        default = optionalString (versionAtLeast config.system.stateVersion "22.05") "ntopng";
         description = lib.mdDoc ''
           Local Redis instance name. Set to `null` to disable
           local Redis instance. Defaults to `""` for