diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index f5455267b28..3adfa979edc 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -308,7 +308,7 @@ let
           # builds stuff in the VM, needs more juice
           virtualisation.diskSize = 8 * 1024;
           virtualisation.cores = 8;
-          virtualisation.memorySize = 2047;
+          virtualisation.memorySize = 1536;
 
           boot.initrd.systemd.enable = systemdStage1;