diff --git a/archachatina.nix b/archachatina.nix
index 615404f..2bf7f1f 100644
--- a/archachatina.nix
+++ b/archachatina.nix
@@ -99,6 +99,6 @@
     extraPlugins = [ pkgs.postgis ];
   };
 
-  system.nixos.stateVersion = "18.03";
+  system.stateVersion = "18.03";
 
 }
diff --git a/petalius.nix b/petalius.nix
index 4038835..d31c93c 100644
--- a/petalius.nix
+++ b/petalius.nix
@@ -87,6 +87,6 @@
 
   #services.avahi.nssmdns = true;
 
-  system.nixos.stateVersion = "18.03";
+  system.stateVersion = "18.03";
 
 }