diff --git a/nix/default.nix b/nix/default.nix
index e6718411b5a9cb7867c177d8deaf79d84c204bc3..139b30bb8501510da6b1abda14d9f55587286d85 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -105,7 +105,7 @@ pkgs.lib.makeExtensible
         buildPhase = ''
                make lint
                make stats-lint
-               make check-headers
+               STRICT_HEADERS=yes make check-headers
         '';
         installPhase = ''
                true