diff --git a/sdf/SdfReader.cc b/sdf/SdfReader.cc
index 05515d27..9e470d91 100644
--- a/sdf/SdfReader.cc
+++ b/sdf/SdfReader.cc
@@ -1034,8 +1034,9 @@ Pin *
 SdfReader::findPin(const char *name)
 {
   if (path_) {
-    string path_name;
-    stringPrint(path_name, "%s%c%s", path_, divider_, name);
+    string path_name = path_;
+    path_name += divider_;
+    path_name += name;
     Pin *pin = network_->findPin(path_name.c_str());
     return pin;
   }
@@ -1046,9 +1047,14 @@ SdfReader::findPin(const char *name)
 Instance *
 SdfReader::findInstance(const char *name)
 {
-  string inst_name = name;
-  if (path_)
-    stringPrint(inst_name, "%s%c%s", path_, divider_, name);
+  string inst_name;
+  if (path_) {
+    inst_name = path_;
+    inst_name += divider_;
+    inst_name += name;
+  }
+  else
+    inst_name = name;
   Instance *inst = network_->findInstance(inst_name.c_str());
   if (inst == nullptr)
     sdfWarn(195, "instance %s not found.", inst_name.c_str());
diff --git a/search/Property.cc b/search/Property.cc
index 1477856f..01491905 100644
--- a/search/Property.cc
+++ b/search/Property.cc
@@ -713,13 +713,9 @@ getProperty(const LibertyCell *cell,
   else if (stringEqual(property, "full_name")) {
     auto network = sta->cmdNetwork();
     auto lib = cell->libertyLibrary();
-    const char *lib_name = lib->name();
-    const char *cell_name = cell->name();
-    string full_name;
-    stringPrint(full_name, "%s%c%s",
-		lib_name,
-		network->pathDivider(),
-		cell_name);
+    string lib_name = lib->name();
+    string cell_name = cell->name();
+    string full_name = lib_name + network->pathDivider() + cell_name;
     return PropertyValue(full_name);
   }
   else if (stringEqual(property, "filename"))
@@ -748,14 +744,10 @@ getProperty(const Cell *cell,
       || stringEqual(property, "base_name"))
     return PropertyValue(network->name(cell));
   else if (stringEqual(property, "full_name")) {
-    auto lib = network->library(cell);
-    const char *lib_name = network->name(lib);
-    const char *cell_name = network->name(cell);
-    string full_name;
-    stringPrint(full_name, "%s%c%s",
-		lib_name,
-		network->pathDivider(),
-		cell_name);
+    Library *lib = network->library(cell);
+    string lib_name = network->name(lib);
+    string cell_name = network->name(cell);
+    string full_name = lib_name + network->pathDivider() + cell_name;
     return PropertyValue(full_name);
   }
   else if (stringEqual(property, "library"))