diff --git a/liberty/Liberty.cc b/liberty/Liberty.cc
index 5e4328ad..17d0b464 100644
--- a/liberty/Liberty.cc
+++ b/liberty/Liberty.cc
@@ -3042,7 +3042,7 @@ OperatingConditions::OperatingConditions(const char *name) :
   Pvt(0.0, 0.0, 0.0),
   name_(name),
   // Default wireload tree.
-  wire_load_tree_(WireloadTree::balanced)
+  wire_load_tree_(WireloadTree::unknown)
 {
 }
 
diff --git a/parasitics/Parasitics.cc b/parasitics/Parasitics.cc
index ab304bda..69187f95 100644
--- a/parasitics/Parasitics.cc
+++ b/parasitics/Parasitics.cc
@@ -257,12 +257,12 @@ Parasitics::makeWireloadNetwork(const Pin *drvr_pin,
         makeWireloadNetworkWorst(parasitic, drvr_pin, net, wireload_cap,
                                  wireload_res, fanout);
         break;
+      case WireloadTree::unknown:
       case WireloadTree::balanced:
         makeWireloadNetworkBalanced(parasitic, drvr_pin, wireload_cap, wireload_res,
                                     fanout);
         break;
       case WireloadTree::best_case:
-      case WireloadTree::unknown:
         makeWireloadNetworkBest(parasitic, drvr_pin, wireload_cap, wireload_res,
                                 fanout);
         break;