diff --git a/include/cantera/base/stringUtils.h b/include/cantera/base/stringUtils.h
index 7daafef25..2f98df716 100644
--- a/include/cantera/base/stringUtils.h
+++ b/include/cantera/base/stringUtils.h
@@ -165,6 +165,7 @@ std::string parseSpeciesName(const std::string& nameStr, std::string& phaseName)
 /*!
  * @param  s    Input string to be line wrapped
  * @param  len  Length at which to wrap. The default is 70.
+ * @deprecated Unused. To be removed after Cantera 2.3.
  */
 std::string wrapString(const std::string& s,
                        const int len=70);
diff --git a/src/base/stringUtils.cpp b/src/base/stringUtils.cpp
index eadb481b3..37b822930 100644
--- a/src/base/stringUtils.cpp
+++ b/src/base/stringUtils.cpp
@@ -209,6 +209,7 @@ doublereal fpValueCheck(const std::string& val)
 
 std::string wrapString(const std::string& s, const int len)
 {
+    warn_deprecated("wrapString", "Unused. To be removed after Cantera 2.3.");
     int count=0;
     std::string r;
     for (size_t n = 0; n < s.size(); n++) {