diff --git a/modules/nix-gc.nix b/modules/nix-gc.nix
index c167017..1d228ef 100644
--- a/modules/nix-gc.nix
+++ b/modules/nix-gc.nix
@@ -8,10 +8,10 @@
     automatic = true;
     options = "--delete-older-than 60d";
   }
-  // lib.optionalAttrs (!pkgs.stdenv.isDarwin) {
+  // lib.optionalAttrs (!pkgs.stdenv.hostPlatform.isDarwin) {
     dates = lib.mkDefault "00:15";
   }
-  // lib.optionalAttrs pkgs.stdenv.isDarwin {
+  // lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
     interval = lib.mkDefault {
       Hour = 0;
       Minute = 15;
diff --git a/modules/nix-settings.nix b/modules/nix-settings.nix
index 1f9cf65..2932820 100644
--- a/modules/nix-settings.nix
+++ b/modules/nix-settings.nix
@@ -24,10 +24,10 @@
     # build.
     automatic = true;
   }
-  // lib.optionalAttrs (!pkgs.stdenv.isDarwin) {
+  // lib.optionalAttrs (!pkgs.stdenv.hostPlatform.isDarwin) {
     dates = lib.mkDefault "00:45";
   }
-  // lib.optionalAttrs pkgs.stdenv.isDarwin {
+  // lib.optionalAttrs pkgs.stdenv.hostPlatform.isDarwin {
     interval = lib.mkDefault {
       Hour = 0;
       Minute = 45;
diff --git a/modules/tools.nix b/modules/tools.nix
index 9a211a4..de20cff 100644
--- a/modules/tools.nix
+++ b/modules/tools.nix
@@ -63,7 +63,7 @@ lib.mkMerge [
         usbutils # lsusb
         pciutils # lspci
       ]
-      ++ lib.optionals pkgs.stdenv.isLinux [
+      ++ lib.optionals pkgs.stdenv.hostPlatform.isLinux [
         # Software debug
         iotop
         dool # dool --time --disk -D /dev/sde,/dev/sdf --top-bio --top-cpu --zfs-arc