diff --git a/zfs.nix b/zfs.nix
index a82cb56..70e4fde 100644
--- a/zfs.nix
+++ b/zfs.nix
@@ -22,7 +22,7 @@ in
 
   boot.kernelParams =
     let
-      mb = 12000;
+      mb = 20000;
     in
     [
       "zfs.zfs_arc_max=${builtins.toString (mb * 1000000)}"