diff --git a/npc/core/src/main/scala/Main.scala b/npc/core/src/main/scala/Main.scala
index 656cbd4..aadbb49 100644
--- a/npc/core/src/main/scala/Main.scala
+++ b/npc/core/src/main/scala/Main.scala
@@ -32,5 +32,5 @@ class Keyboard extends Module {
 }
 
 class Flowpc extends Module {
-
+  val register_file = Module(new R)
 }