diff --git a/nixos/release.nix b/nixos/release.nix
index 2f77013ac52f..521bf8f5943c 100644
--- a/nixos/release.nix
+++ b/nixos/release.nix
@@ -107,6 +107,7 @@ let
           echo "file initrd $out/initrd" >> $out/nix-support/hydra-build-products
           echo "file ipxe $out/netboot.ipxe" >> $out/nix-support/hydra-build-products
         '';
+        preferLocalBuild = true;
       };