diff --git a/morph/lib/hardware-vagrant.nix b/morph/lib/hardware-vagrant.nix
index 6c41af4923861e89d144303d129d7babde494363..890d88d5b25ed3cee4598f777de65a167b3f7e45 100644
--- a/morph/lib/hardware-vagrant.nix
+++ b/morph/lib/hardware-vagrant.nix
@@ -26,6 +26,10 @@
     # your boot until you press *.
     boot.initrd.checkJournalingFS = false;
 
+    # Turn on automatic optimization of nix store
+    # https://nixos.wiki/wiki/Storage_optimization
+    nix.autoOptimiseStore = true;
+
     networking.interfaces.enp0s8.ipv4.addresses = [{
       address = config.grid.publicIPv4;
       prefixLength = 24;