diff --git a/01_Code/physical_computing_interface/setup/serve.js b/01_Code/physical_computing_interface/setup/serve.js
index fe3baa429e58bfb54fd4f7715a5f31b7718145e3..b5606038b0bba15f9f2500b9b454cd55bd1c6218 100644
--- a/01_Code/physical_computing_interface/setup/serve.js
+++ b/01_Code/physical_computing_interface/setup/serve.js
@@ -61,7 +61,7 @@ function runPython_urx(setup){
   if(setup.DEMSetup.parameters.run){
     var root="../simulation/dice_firmware/build/x86/src/sim/vis/";
     let outputFile = editJsonFile(`${__dirname}/`+root+`sim_config.json`);
-    outputFile.set("setup", setup.DEMSetup);
+    outputFile.set( setup.DEMSetup);
     outputFile.save();
     console.log("saved the DEM setup in"+ `${__dirname}/`+root+`sim_config.json`);
     console.log();