diff --git a/Makefile b/Makefile
index acb7ba27..06d8b742 100644
--- a/Makefile
+++ b/Makefile
@@ -61,6 +61,9 @@ ha: darwin-set-proxy
 	./result/sw/bin/darwin-rebuild switch --flake .#harmonica
 	sleep 1
 
+ha-rollback:
+	./result/sw/bin/darwin-rebuild rollback
+
 ha-debug: darwin-set-proxy
 	nom build .#darwinConfigurations.harmonica.system --show-trace --verbose
 	./result/sw/bin/darwin-rebuild switch --flake .#harmonica --show-trace --verbose
diff --git a/modules/darwin/nix-core.nix b/modules/darwin/nix-core.nix
index 1aa111de..044af5a8 100644
--- a/modules/darwin/nix-core.nix
+++ b/modules/darwin/nix-core.nix
@@ -11,16 +11,23 @@
   #
   ###################################################################################
 
+  # Fix: https://github.com/LnL7/nix-darwin/issues/149#issuecomment-1741720259
+  # nix is installed via DeterminateSystems's nix-installer.
+  environment.etc."zshrc".knownSha256Hashes = [
+    "b9902f2020c636aeda956a74b5ae11882d53e206d1aa50b3abe591a8144fa710"
+  ];
+  environment.etc."bashrc".knownSha256Hashes = [
+    "204d2a960b3ab80e51748d3db0b63d940347ba71119ae6f14cccfec35da56cce"
+  ];
+  environment.etc."zshenv".knownSha256Hashes = [
+    "383a89c1f79c3bcfd2ff39a2b73b5103d0303161b3be9eac88fce83e0789f0b7"
+  ];
+
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;
 
   # Auto upgrade nix package and the daemon service.
-  # services.nix-daemon.enable = false;
-  #
-  # Use this instead of services.nix-daemon.enable if you
-  # don't wan't the daemon service to be managed for you.
-  nix.useDaemon = true;
-
+  services.nix-daemon.enable = true;
   nix.package = pkgs.nix;
 
   # Disable auto-optimise-store because of this issue: