diff --git a/plugins/by-name/conform-nvim/formatter-packages.nix b/plugins/by-name/conform-nvim/formatter-packages.nix
index a0f183a9..7dfcc205 100644
--- a/plugins/by-name/conform-nvim/formatter-packages.nix
+++ b/plugins/by-name/conform-nvim/formatter-packages.nix
@@ -13,6 +13,10 @@ in
 {
   inherit states;
   formatter-packages = {
+    # 2025-12-20 build failure
+    # https://github.com/NixOS/nixpkgs/issues/472704
+    terragrunt_hclfmt = states.broken terragrunt;
+
     # 2025-11-15 dependency swift is broken
     # https://github.com/NixOS/nixpkgs/issues/461474
     swift = states.broken swift;
@@ -152,7 +156,6 @@ in
     inherit (rubyPackages) syntax_tree;
     tclfmt = tclint;
     terraform_fmt = tenv;
-    terragrunt_hclfmt = terragrunt;
     tofu_fmt = opentofu;
     v = vlang;
     xmlformatter = xmlformat;
diff --git a/tests/all-package-defaults.nix b/tests/all-package-defaults.nix
index a12fe880..02f56d99 100644
--- a/tests/all-package-defaults.nix
+++ b/tests/all-package-defaults.nix
@@ -18,6 +18,10 @@ let
     "sourcekit-lsp"
     "swift-format"
 
+    # 2025-12-20 build failure
+    # https://github.com/NixOS/nixpkgs/issues/472704
+    "terragrunt"
+
     # 2025-10-12 dependency mbedtls is marked as insecure
     "haxe"
   ]
diff --git a/tests/test-sources/plugins/by-name/none-ls/default.nix b/tests/test-sources/plugins/by-name/none-ls/default.nix
index bd162871..96578a57 100644
--- a/tests/test-sources/plugins/by-name/none-ls/default.nix
+++ b/tests/test-sources/plugins/by-name/none-ls/default.nix
@@ -100,6 +100,11 @@
         sources =
           let
             disabled = [
+              # TODO Added 2025-12-20 build failure
+              # https://github.com/NixOS/nixpkgs/issues/472704
+              "terragrunt_fmt"
+              "terragrunt_validate"
+
               # TODO Added 2025-11-15
               # dependency swift is broken
               # https://github.com/NixOS/nixpkgs/issues/461474