diff --git a/nixos/modules/services/web-servers/unit/default.nix b/nixos/modules/services/web-servers/unit/default.nix
index 894271d1e55e..2a264bf2e9a6 100644
--- a/nixos/modules/services/web-servers/unit/default.nix
+++ b/nixos/modules/services/web-servers/unit/default.nix
@@ -28,10 +28,12 @@ in {
         description = "Group account under which unit runs.";
       };
       stateDir = mkOption {
+        type = types.path;
         default = "/var/spool/unit";
         description = "Unit data directory.";
       };
       logDir = mkOption {
+        type = types.path;
         default = "/var/log/unit";
         description = "Unit log directory.";
       };