diff --git a/nixos/tests/gnome3-gdm.nix b/nixos/tests/gnome3-gdm.nix
index 2c9c745021af..4b459e93e1be 100644
--- a/nixos/tests/gnome3-gdm.nix
+++ b/nixos/tests/gnome3-gdm.nix
@@ -21,7 +21,7 @@ import ./make-test.nix ({ pkgs, ...} : {
       };
       services.xserver.desktopManager.gnome3.enable = true;
 
-      virtualisation.memorySize = 512;
+      virtualisation.memorySize = 1024;
     };
 
   testScript =