diff --git a/flake.nix b/flake.nix
index a6b697e31e..62d808d391 100644
--- a/flake.nix
+++ b/flake.nix
@@ -122,6 +122,8 @@
               compdb
               jq
               gh
+              lcov # for code coverage
+              xdg_utils # for xdg-open to open html files
             ])
             (with proj-repo.packages.${system}; [
               proj