diff --git a/include/sta/ConcreteNetwork.hh b/include/sta/ConcreteNetwork.hh
index 3efe72a5..a07c4082 100644
--- a/include/sta/ConcreteNetwork.hh
+++ b/include/sta/ConcreteNetwork.hh
@@ -230,6 +230,10 @@ public:
   void setLinkFunc(LinkNetworkFunc *link) override;
   static ObjectId nextObjectId();
 
+  // Used by external tools.
+  void setTopInstance(Instance *top_inst);
+  void deleteTopInstance();
+
   using Network::netIterator;
   using Network::findPin;
   using Network::findNet;
@@ -240,8 +244,6 @@ public:
   using Network::isLeaf;
 
 protected:
-  void setTopInstance(Instance *top_inst);
-  void deleteTopInstance();
   void addLibrary(ConcreteLibrary *library);
   void setName(const char *name);
   void clearConstantNets();
diff --git a/search/ReportPath.cc b/search/ReportPath.cc
index d165e380..01fb3816 100644
--- a/search/ReportPath.cc
+++ b/search/ReportPath.cc
@@ -253,10 +253,8 @@ ReportPath::setDigits(int digits)
 {
   digits_ = digits;
 
-  if (plus_zero_) {
-    stringDelete(plus_zero_);
-    stringDelete(minus_zero_);
-  }
+  stringDelete(plus_zero_);
+  stringDelete(minus_zero_);
   minus_zero_ = stringPrint("-%.*f", digits_, 0.0);
   plus_zero_  = stringPrint("%.*f", digits_, 0.0);
 }
@@ -3164,11 +3162,16 @@ ReportPath::reportField(float value,
     reportFieldBlank(field, line);
   else {
     Unit *unit = field->unit();
-    const char *value_str = (unit)
-      ? unit->asString(value, digits_)
+    if (unit) {
+      const char *value_str = unit->asString(value, digits_);
+      reportField(value_str, field, line);
+    }
+    else {
       // fanout
-      : stringPrintTmp("%.0f", value);
-    reportField(value_str, field, line);
+      string value_str;
+      stringPrint(value_str, "%.0f", value);
+      reportField(value_str.c_str(), field, line);
+    }
   }
 }