diff --git a/system/programs/unbound.nix b/system/programs/unbound.nix
index 940295e..7874378 100644
--- a/system/programs/unbound.nix
+++ b/system/programs/unbound.nix
@@ -14,6 +14,7 @@ in
       settings = {
         server = {
           prefetch = true;
+          cache-max-negative-ttl = 5;
         };
       };
     };