diff --git a/uncore/src/main/scala/debug.scala b/uncore/src/main/scala/debug.scala
index 42d38def..eb7eb5df 100644
--- a/uncore/src/main/scala/debug.scala
+++ b/uncore/src/main/scala/debug.scala
@@ -454,7 +454,7 @@ class DebugModule ()(implicit val p:cde.Parameters)
   val dbRamRdEn   = Wire(Bool())
 
   val sbRamAddr   = Wire(UInt(width=sbRamAddrWidth))
-  val sbRamRdData = Reg (UInt(width=sbRamDataWidth))
+  val sbRamRdData = Wire (UInt(width=sbRamDataWidth))
   val sbRamWrData = Wire(UInt(width=sbRamDataWidth))
   val sbRamWrEn   = Wire(Bool())
   val sbRamRdEn   = Wire(Bool())