diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index b84e589e84cb..00c7b915c883 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -363,6 +363,7 @@ let
       };
       metricProvider = {
         services.rspamd.enable = true;
+        virtualisation.memorySize = 1024;
       };
       exporterTest = ''
         wait_for_unit("rspamd.service")