diff --git a/darwin.nix b/darwin.nix
index 7052d7d4..4ee0b385 100644
--- a/darwin.nix
+++ b/darwin.nix
@@ -6,6 +6,10 @@
     automatic = true;
     interval = { Hour = 3; Minute = 0; }; # run at 3 am
   };
+  nix.optimise = {
+    automatic = true;
+    interval = { Hour = 3; Minute = 13; }; # run at 3:13 am
+  };
 
   nix.registry = {
     templates = {