diff --git a/demos/prepare_demo_trailer.m b/demos/prepare_demo_trailer.m
index 72288b5..7feade0 100644
--- a/demos/prepare_demo_trailer.m
+++ b/demos/prepare_demo_trailer.m
@@ -4,7 +4,8 @@
 %   enviroment. (output location is repo/test_controller_builds/demo_controller_matlab)
 
     % generate static files
-    trailer_controller_output_location =  ['../test_controller_builds/' controller_folder_name];
+    rootdir = get_nmpc_codegen_matlab_rootdir();    
+    trailer_controller_output_location =  fullfile(rootdir, 'test_controller_builds', controller_folder_name);
     nmpccodegen.tools.Bootstrapper.bootstrap(trailer_controller_output_location, true);
 
     % get example model from lib
diff --git a/get_nmpc_codegen_matlab_rootdir.m b/get_nmpc_codegen_matlab_rootdir.m
new file mode 100644
index 0000000..87fb2c2
--- /dev/null
+++ b/get_nmpc_codegen_matlab_rootdir.m
@@ -0,0 +1,4 @@
+function rootdir = get_nmpc_codegen_matlab_rootdir()
+rootdir = which('get_nmpc_codegen_matlab_rootdir');
+tokens = strsplit(rootdir, 'get_nmpc_codegen_matlab_rootdir.m');
+rootdir = tokens{1};
\ No newline at end of file