diff --git a/network/ConcreteLibrary.cc b/network/ConcreteLibrary.cc
index 27af31b9..2514aa86 100644
--- a/network/ConcreteLibrary.cc
+++ b/network/ConcreteLibrary.cc
@@ -426,8 +426,10 @@ ConcreteCell::groupBusPorts(const char bus_brkt_left,
 		    int index1, index2;
 		    parseBusName(port1->name(), bus_brkts_left, bus_brkts_right, escape_,
 				 bus_name, index1);
+		    stringDelete(bus_name);
 		    parseBusName(port2->name(), bus_brkts_left, bus_brkts_right, escape_,
 				 bus_name, index2);
+		    stringDelete(bus_name);
 		    return index1 > index2;
 		  });
     ConcretePort *port = makeBusPort(bus_name, bus_port->from(),
diff --git a/sdc/Sdc.cc b/sdc/Sdc.cc
index 9d2839b1..2473f480 100644
--- a/sdc/Sdc.cc
+++ b/sdc/Sdc.cc
@@ -235,6 +235,7 @@ Sdc::initVariables()
   max_area_ = 0.0;
   path_delays_without_to_ = false;
   clk_hpin_disables_valid_ = false;
+  have_clk_slew_limits_ = false;
 }
 
 void