diff --git a/nixos/modules/services/cluster/fleet.nix b/nixos/modules/services/cluster/fleet.nix
index 04d95fbf186..041f4426911 100644
--- a/nixos/modules/services/cluster/fleet.nix
+++ b/nixos/modules/services/cluster/fleet.nix
@@ -90,7 +90,7 @@ in {
 
     extraConfig = mkOption {
       type = types.attrsOf types.str;
-      apply = mapAttrs' (n: v: nameValuePair ("ETCD_" + n) v);
+      apply = mapAttrs' (n: v: nameValuePair ("FLEET_" + n) v);
       default = {};
       example = literalExample ''
         {