diff --git a/darwin/kuro/configuration.nix b/darwin/kuro/configuration.nix
index 4a502c67..139cb175 100644
--- a/darwin/kuro/configuration.nix
+++ b/darwin/kuro/configuration.nix
@@ -22,6 +22,7 @@
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
         # "mirai:bcVPoFGBZ0i7JAKMXIqLj2GY3CulLC4kP7rQyqes1RM="
       ];
+      download-buffer-size = 524288000;
     };
     extraOptions = ''
       build-users-group = nixbld
diff --git a/nixos/ryu/configuration.nix b/nixos/ryu/configuration.nix
index cdaeab4f..ca32080f 100644
--- a/nixos/ryu/configuration.nix
+++ b/nixos/ryu/configuration.nix
@@ -49,6 +49,7 @@
       extra-experimental-features = "nix-command flakes auto-allocate-uids";
       trusted-users = [device.user];
       extra-sandbox-paths = [config.programs.ccache.cacheDir];
+      download-buffer-size = 524288000;
     };
     extraOptions = ''
       build-users-group = nixbld