diff --git a/flake.nix b/flake.nix
index 2d68f24..2408a85 100644
--- a/flake.nix
+++ b/flake.nix
@@ -94,6 +94,9 @@
         system = "x86_64-linux";
         modules = [
           ./system/nixos-wsl/configuration.nix
+          ./system/dotnet_os_codename-workaround.nix
+            # Source of this fix file is
+            # https://github.com/nazarewk-iac/nix-configs/blob/main/modules/ascii-workaround.nix
           ./system/nix_lix.nix
           nixos-wsl.nixosModules.wsl
           lix-module.nixosModules.default
diff --git a/system/dotnet_os_codename-workaround.nix b/system/dotnet_os_codename-workaround.nix
new file mode 100644
index 0000000..16b1067
--- /dev/null
+++ b/system/dotnet_os_codename-workaround.nix
@@ -0,0 +1,19 @@
+/* Last reviewied: 2024-05-29
+
+  fixes issues with lack of HTTP header sanitization in .NET Core, see:
+  - https://github.com/NixOS/nixpkgs/issues/315574
+  - https://github.com/microsoftgraph/msgraph-cli/issues/477
+*/
+{ lib, options, ... }: {
+  /*
+    using just `readOnly` because it can contain neither of: default, example, description, apply, type
+    see https://github.com/NixOS/nixpkgs/blob/aae38d0d557d2f0e65b2ea8e1b92219f2c0ea8f9/lib/modules.nix#L752-L756
+   */
+  options.system.nixos.codeName = lib.mkOption { readOnly = false; };
+  config.system.nixos.codeName =
+    let
+      codeName = options.system.nixos.codeName.default;
+      renames."Vicuña" = "Vicuna";
+    in
+      renames."${codeName}" or (throw "Unknown `codeName`: ${codeName}, please add it to `renames` in `ascii-workaround.nix`");
+}