diff --git a/nixos/tests/installer.nix b/nixos/tests/installer.nix
index df89949074f9..d80cfb4bd83f 100644
--- a/nixos/tests/installer.nix
+++ b/nixos/tests/installer.nix
@@ -285,7 +285,7 @@ let
           ];
 
           virtualisation.diskSize = 8 * 1024;
-          virtualisation.memorySize = 1024;
+          virtualisation.memorySize = 1536;
 
           # Use a small /dev/vdb as the root disk for the
           # installer. This ensures the target disk (/dev/vda) is