diff --git a/configuration/environment.nix b/configuration/environment.nix
index aa6ba87..83765ed 100644
--- a/configuration/environment.nix
+++ b/configuration/environment.nix
@@ -8,9 +8,6 @@ let
 in
 
 {
-  # Nombre de process d'installation en parrallèle effectués par Nix
-  nix.buildCores = 0;
-
   # The NixOS release to be compatible with for stateful data such as databases.
   system.stateVersion = "19.09";
 
diff --git a/configuration/nix-options.nix b/configuration/nix-options.nix
index 52971c4..b44530a 100644
--- a/configuration/nix-options.nix
+++ b/configuration/nix-options.nix
@@ -13,7 +13,11 @@ in
 
   system.autoUpgrade.enable = flags.auto-upgrade;
   nix = {
-    autoOptimiseStore = true;
+    settings = {
+      auto-optimise-store = true;
+      # Nombre de process d'installation en parrallèle effectués par Nix
+      cores = 0;
+    };
     gc = {
       automatic = true;
       dates = "daily";