diff --git a/machines/manager/mpi.nix b/machines/manager/mpi.nix
index 098fccc..dc37270 100644
--- a/machines/manager/mpi.nix
+++ b/machines/manager/mpi.nix
@@ -5,7 +5,7 @@ with lib;
 {
   environment.etc."mpi/hosts" = {
     text = concatMapStringsSep "\n"
-      (node: "${node.config.networking.hostName} max_slots=64")
+      (node: "${node.config.networking.hostName} max_slots=32")
       (filter
         (node: elem "node" node.config.deployment.tags)
         (attrValues nodes));