diff --git a/services/minecraft.nix b/services/minecraft.nix
index be362b4..87983be 100644
--- a/services/minecraft.nix
+++ b/services/minecraft.nix
@@ -6,9 +6,6 @@
   config,
   ...
 }:
-let
-  heap_size = "4000M";
-in
 {
   environment.systemPackages = [
     (pkgs.writeScriptBin "mc-console" ''
@@ -33,7 +30,11 @@ in
       enable = true;
       package = pkgs.fabricServers.fabric-1_21_4;
 
-      jvmOpts = "-Xmx${heap_size} -Xms${heap_size} -XX:+UseZGC -XX:+ZGenerational";
+      jvmOpts =
+        let
+          heap_size = "4000M";
+        in
+        "-Xmx${heap_size} -Xms${heap_size} -XX:+UseZGC -XX:+ZGenerational";
 
       serverProperties = {
         server-port = 25565;