diff --git a/nixos/modules/services/misc/dysnomia.nix b/nixos/modules/services/misc/dysnomia.nix
index 7d9c39a69737..1964fa93f936 100644
--- a/nixos/modules/services/misc/dysnomia.nix
+++ b/nixos/modules/services/misc/dysnomia.nix
@@ -186,7 +186,7 @@ in
 
     dysnomia.properties = {
       hostname = config.networking.hostName;
-      inherit (config.nixpkgs.localSystem) system;
+      inherit (pkgs.stdenv.hostPlatform) system;
 
       supportedTypes = [
         "echo"
diff --git a/nixos/modules/virtualisation/nixos-containers.nix b/nixos/modules/virtualisation/nixos-containers.nix
index b93015157129..deb9742a2c11 100644
--- a/nixos/modules/virtualisation/nixos-containers.nix
+++ b/nixos/modules/virtualisation/nixos-containers.nix
@@ -132,7 +132,7 @@ let
 
       # If the host is 64-bit and the container is 32-bit, add a
       # --personality flag.
-      ${optionalString (config.nixpkgs.localSystem.system == "x86_64-linux") ''
+      ${optionalString (pkgs.stdenv.hostPlatform.system == "x86_64-linux") ''
         if [ "$(< ''${SYSTEM_PATH:-/nix/var/nix/profiles/per-container/$INSTANCE/system}/system)" = i686-linux ]; then
           extraFlags+=" --personality=x86"
         fi