diff --git a/system/configuration.nix b/system/configuration.nix
index 5d94de1..ee3f630 100644
--- a/system/configuration.nix
+++ b/system/configuration.nix
@@ -122,7 +122,7 @@
 
   # List packages installed in system profile. To search, run:
   # $ nix search wget
-  environment.systemPackages ++= with pkgs; [
+  environment.systemPackages = with pkgs; [
     vim  # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
     ((emacsPackagesNgGen emacs).emacsWithPackages (epkgs: [
       epkgs.vterm
diff --git a/system/containerd.nix b/system/containerd.nix
index 1c1f4e2..8d00479 100644
--- a/system/containerd.nix
+++ b/system/containerd.nix
@@ -8,7 +8,7 @@
 #    };
   };
 
-  environment.systemPackages ++= with pkgs; [
+  environment.systemPackages = with pkgs; [
     cni
     cni-plugins
   ];