diff --git a/generators/example/src/main/scala/ConfigMixins.scala b/generators/example/src/main/scala/ConfigMixins.scala
index 1380b90b..8e8f017b 100644
--- a/generators/example/src/main/scala/ConfigMixins.scala
+++ b/generators/example/src/main/scala/ConfigMixins.scala
@@ -4,17 +4,15 @@ import chisel3._
 import chisel3.util.{log2Up}
 
 import freechips.rocketchip.config.{Parameters, Config}
-import freechips.rocketchip.subsystem.{RocketTilesKey, WithRoccExample, WithNMemoryChannels, WithNBigCores, WithRV32}
+import freechips.rocketchip.subsystem.{WithRoccExample, WithNMemoryChannels, WithNBigCores, WithRV32}
 import freechips.rocketchip.diplomacy.{LazyModule, ValName}
 import freechips.rocketchip.devices.tilelink.BootROMParams
-import freechips.rocketchip.tile.{XLen, MaxHartIdBits}
+import freechips.rocketchip.tile.{XLen}
 
 import testchipip._
 
 import sifive.blocks.devices.gpio._
 
-import boom.system.{BoomTilesKey}
-
 /**
  * TODO: Why do we need this?
  */