diff --git a/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala b/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
index 47f24cdc77..534259abb3 100644
--- a/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
+++ b/generators/chipyard/src/main/scala/config/fragments/SubsystemFragments.scala
@@ -1,10 +1,13 @@
 package chipyard.config
 
 import freechips.rocketchip.config.{Config}
-import freechips.rocketchip.subsystem.{BankedL2Key, CoherenceManagerWrapper}
+import freechips.rocketchip.subsystem.{SystemBusKey, BankedL2Key, CoherenceManagerWrapper}
 
 // Replaces the L2 with a broadcast manager for maintaining coherence
 class WithBroadcastManager extends Config((site, here, up) => {
   case BankedL2Key => up(BankedL2Key, site).copy(coherenceManager = CoherenceManagerWrapper.broadcastManager)
 })
 
+class WithSystemBusWidth(bitWidth: Int) extends Config((site, here, up) => {
+  case SystemBusKey => up(SystemBusKey, site).copy(beatBytes=bitWidth/8)
+})