diff --git a/caravel.py b/caravel.py
index a5d0e26..979a1f6 100644
--- a/caravel.py
+++ b/caravel.py
@@ -57,6 +57,7 @@ class CaravelConfig():
             for module in placed_modules['modules']:
                 mux_address = (module['y'] << 5) + module['x']
                 module_name = 'tt_um_' + module['name']
+                project = next(p for p in self.projects if p.top_module == module_name)
                 mux_index[mux_address] = {
                     "macro": module_name,
                     "x": module['x'],