diff --git a/pkgs/tools/nix/nixos-option/.clang-tidy b/pkgs/tools/nix/nixos-option/.clang-tidy
index 4627a18c7161..ef187ed77fb5 100644
--- a/pkgs/tools/nix/nixos-option/.clang-tidy
+++ b/pkgs/tools/nix/nixos-option/.clang-tidy
@@ -4,6 +4,8 @@ Checks:
 - -bugprone-easily-swappable-parameters
 - performance-*
 - modernize-*
+# doesn't improve readability much in this project
+- -modernize-use-trailing-return-type
 - readability-*
 # don't find them too problematic
 - -readability-identifier-length