diff --git a/tests/github-flakes.nix b/tests/github-flakes.nix
index d9f7d71cd..039e508a4 100644
--- a/tests/github-flakes.nix
+++ b/tests/github-flakes.nix
@@ -96,6 +96,7 @@ makeTest (
       client =
         { config, lib, pkgs, nodes, ... }:
         { virtualisation.writableStore = true;
+          virtualisation.diskSize = 2048;
           virtualisation.pathsInNixDB = [ pkgs.hello pkgs.fuse ];
           nix.binaryCaches = lib.mkForce [ ];
           nix.extraOptions = "experimental-features = nix-command flakes";