diff --git a/rocket/src/main/scala/tlb.scala b/rocket/src/main/scala/tlb.scala
index eb6b72ce..ee624896 100644
--- a/rocket/src/main/scala/tlb.scala
+++ b/rocket/src/main/scala/tlb.scala
@@ -11,7 +11,7 @@ case object NTLBEntries extends Field[Int]
 
 trait HasTLBParameters extends HasAddrMapParameters {
   val entries = p(NTLBEntries)
-  val camAddrBits = ceil(log(entries)/log(2)).toInt
+  val camAddrBits = log2Ceil(entries)
   val camTagBits = asIdBits + vpnBits
 }