diff --git a/npc/core/src/main/scala/Main.scala b/npc/core/src/main/scala/Main.scala
index 9443937..c28fe88 100644
--- a/npc/core/src/main/scala/Main.scala
+++ b/npc/core/src/main/scala/Main.scala
@@ -1,7 +1,7 @@
 package npc
 
 import chisel3._
-import chisel3.utils.{MuxLookup}
+import chisel3.util.{MuxLookup, Fill}
 import chisel3.stage.ChiselOption
 
 class RegisterFile(readPorts: Int) extends Module {