diff --git a/nixos/tests/neo4j.nix b/nixos/tests/neo4j.nix
index ca60f6cd893..1eef7b545b7 100644
--- a/nixos/tests/neo4j.nix
+++ b/nixos/tests/neo4j.nix
@@ -6,7 +6,7 @@ import ./make-test-python.nix {
       { ... }:
 
       {
-	# virtualisation.memorySize = 4096;
+	virtualisation.memorySize = 4096;
 	virtualisation.diskSize = 1024;
 
         services.neo4j.enable = true;