diff --git a/darwin/modules/services/clash/default.nix b/darwin/modules/services/clash/default.nix
index 0795c66..f32f3c7 100644
--- a/darwin/modules/services/clash/default.nix
+++ b/darwin/modules/services/clash/default.nix
@@ -33,7 +33,7 @@ in {
     };
     extraOpts = lib.mkOption {
       default = null;
-      type = lib.types.nullOr lib.types.string;
+      type = lib.types.nullOr lib.types.str;
       description = "Extra command line options to use.";
     };
   };
diff --git a/nixos/modules/services/clash.nix b/nixos/modules/services/clash.nix
index 7bf827d..f5cafc6 100644
--- a/nixos/modules/services/clash.nix
+++ b/nixos/modules/services/clash.nix
@@ -33,7 +33,7 @@ in {
     };
     extraOpts = lib.mkOption {
       default = null;
-      type = lib.types.nullOr lib.types.string;
+      type = lib.types.nullOr lib.types.str;
       description = "Extra command line options to use.";
     };
   };