diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index 3e49c5b96682..c12919540a30 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -243,6 +243,11 @@ let
               ++ optionals (bootLoader == "grub" && grubVersion == 2) [ pkgs.grub2 pkgs.grub2_efi ];
 
             nix.binaryCaches = mkForce [ ];
+            nix.extraOptions =
+              ''
+                hashed-mirrors =
+                connect-timeout = 1
+              '';
           };
 
       };