diff --git a/npc/constr/Flow.nxdc b/npc/constr/Flow.nxdc
index acc60e9..7f82796 100644
--- a/npc/constr/Flow.nxdc
+++ b/npc/constr/Flow.nxdc
@@ -1 +1,3 @@
 top=Flow
+
+io_clock(LD0)
diff --git a/npc/core/src/main/scala/Main.scala b/npc/core/src/main/scala/Main.scala
index 4455a0a..1ede7e1 100644
--- a/npc/core/src/main/scala/Main.scala
+++ b/npc/core/src/main/scala/Main.scala
@@ -125,7 +125,5 @@ class Flow extends Module {
   alu.in.a(aSrcImm.litValue.toInt) := inst(31, 20)
   alu.in.b := reg.out.src(1)
 
-  val pcValue = IO(Output(chiselTypeOf(pc.out)))
-  pcValue := pc.out
   dontTouch(control.out)
 }