diff --git a/junctions/src/main/scala/memserdes.scala b/junctions/src/main/scala/memserdes.scala
index 52abf3c3..b66e5150 100644
--- a/junctions/src/main/scala/memserdes.scala
+++ b/junctions/src/main/scala/memserdes.scala
@@ -57,7 +57,7 @@ class MemPipeIO(implicit p: Parameters) extends ParameterizedBundle()(p) {
 class MemSerializedIO(w: Int)(implicit p: Parameters) extends ParameterizedBundle()(p) {
   val req = Decoupled(Bits(width = w))
   val resp = Valid(Bits(width = w)).flip
-  //override def cloneType = new MemSerializedIO(w)(p).asInstanceOf[this.type]
+  override def cloneType = new MemSerializedIO(w)(p).asInstanceOf[this.type]
 }
 
 class MemSerdes(w: Int)(implicit p: Parameters) extends MIFModule
diff --git a/junctions/src/main/scala/util.scala b/junctions/src/main/scala/util.scala
index 865d63b5..28d5a470 100644
--- a/junctions/src/main/scala/util.scala
+++ b/junctions/src/main/scala/util.scala
@@ -8,7 +8,17 @@ object bigIntPow2 {
 }
 
 class ParameterizedBundle(implicit p: Parameters) extends Bundle {
-  override def cloneType = this.getClass.getConstructors.head.newInstance(p).asInstanceOf[this.type]
+  override def cloneType = {
+    try {
+      this.getClass.getConstructors.head.newInstance(p).asInstanceOf[this.type]
+    } catch {
+      case e: java.lang.IllegalArgumentException =>
+        throwException("Unable to use ParamaterizedBundle.cloneType on " +
+                       this.getClass + ", probably because " + this.getClass +
+                       "() takes more than one argument.  Consider overriding " +
+                       "cloneType() on " + this.getClass, e)
+    }
+  }
 }
 
 class HellaFlowQueue[T <: Data](val entries: Int)(data: => T) extends Module {