diff --git a/HTTP.cpp b/HTTP.cpp
index 66dbc763..3f6fd937 100644
--- a/HTTP.cpp
+++ b/HTTP.cpp
@@ -193,6 +193,10 @@ namespace http {
     return out;
   }
 
+  void HTTPMsg::add_header(const char *name, std::string & value, bool replace) {
+    add_header(name, value.c_str(), replace);
+  }
+
   void HTTPMsg::add_header(const char *name, const char *value, bool replace) {
     std::size_t count = headers.count(name);
     if (count && !replace)
diff --git a/HTTP.h b/HTTP.h
index 0aa31b1e..f227271f 100644
--- a/HTTP.h
+++ b/HTTP.h
@@ -57,6 +57,7 @@ namespace http {
   struct HTTPMsg {
     std::map<std::string, std::string> headers;
 
+    void add_header(const char *name, std::string & value, bool replace = false);
     void add_header(const char *name, const char *value, bool replace = false);
     void del_header(const char *name);