diff --git a/nixos/tests/kde4.nix b/nixos/tests/kde4.nix
index 725759ab758a..99a82a6b95df 100644
--- a/nixos/tests/kde4.nix
+++ b/nixos/tests/kde4.nix
@@ -5,7 +5,7 @@ import ./make-test.nix ({ pkgs, ... }: {
 
     { imports = [ ./common/user-account.nix ];
 
-      virtualisation.memorySize = 768;
+      virtualisation.memorySize = 1024;
 
       services.xserver.enable = true;