diff --git a/include/sta/StringUtil.hh b/include/sta/StringUtil.hh
index d06eef34..c2468006 100644
--- a/include/sta/StringUtil.hh
+++ b/include/sta/StringUtil.hh
@@ -170,9 +170,6 @@ stringPrint(string &str,
 char *
 stringPrintTmp(const char *fmt,
 	       ...)  __attribute__((format (printf, 1, 2)));
-// Caller owns returned string.
-char *
-integerString(int number);
 
 char *
 makeTmpString(size_t length);
diff --git a/search/CheckTiming.cc b/search/CheckTiming.cc
index e1940853..7bfbf2ef 100644
--- a/search/CheckTiming.cc
+++ b/search/CheckTiming.cc
@@ -424,9 +424,7 @@ CheckTiming::errorMsgSubst(const char *msg,
 	s++;
       }
       else if (flag == 'd') {
-	const char *obj_str = integerString(obj_count);
-	error_msg += obj_str;
-	stringDelete(obj_str);
+	error_msg += std::to_string(obj_count);
 	s++;
       }
       else
diff --git a/search/ReportPath.cc b/search/ReportPath.cc
index 68ca4c95..818e2add 100644
--- a/search/ReportPath.cc
+++ b/search/ReportPath.cc
@@ -814,7 +814,8 @@ ReportPath::reportEndpointOutputDelay(const PathEndClkConstrained *end)
   else {
     if (tgt_clk) {
       string clk_name = tgtClkName(end);
-      auto reason = stdstrPrint("internal path endpoint clocked by %s", clk_name.c_str());
+      auto reason = stdstrPrint("internal path endpoint clocked by %s",
+                                clk_name.c_str());
 
       reportEndpoint(pin_name, reason);
     }
diff --git a/util/StringUtil.cc b/util/StringUtil.cc
index 95f8d13e..77b69968 100644
--- a/util/StringUtil.cc
+++ b/util/StringUtil.cc
@@ -60,12 +60,6 @@ isDigits(const char *str)
 
 ////////////////////////////////////////////////////////////////
 
-char *
-integerString(int number)
-{
-  return stringPrint("%d", number);
-}
-
 // print for c++ strings.
 void
 stringPrint(string &str,