diff --git a/hydra/firmware.nix b/hydra/firmware.nix
index 4d3424833807d8e4002c0b7896a92d83d9bcf6fa..94ba793b27e19ca5cde6d8c6b7b62e3eb0fc4d5a 100644
--- a/hydra/firmware.nix
+++ b/hydra/firmware.nix
@@ -8,6 +8,8 @@ let
     srcPath = ".";
   }).override (oldArgs: {
     src = oldArgs.src.overrideAttrs (oldAttrs: {
+      # no more git, .git is dropped by Hydra
+      nativeBuildInputs = [];
       postPatch = ''
         VERSION="0.0-git"
         GITHASH="0000000000000000000000000000000000000000"