diff --git a/uncore/src/main/scala/ahb.scala b/uncore/src/main/scala/ahb.scala
index 1e1a9455..80442dbe 100644
--- a/uncore/src/main/scala/ahb.scala
+++ b/uncore/src/main/scala/ahb.scala
@@ -241,7 +241,7 @@ class AHBBusMaster(implicit val p: Parameters) extends Module
   val hmastlock = Reg(init = Bool(false))
   val hwrite    = Reg(Bool())
   val hburst    = Reg(UInt())
-  val hsize     = Reg(UInt())
+  val hsize     = Reg(init = UInt(0, width = SZ_HSIZE))
   val hprot     = Reg(UInt())
   val hwdata0   = Reg(Bits())
   val hwdata1   = Reg(Bits())