diff --git a/libretroshare/src/pqi/pqiperson.h b/libretroshare/src/pqi/pqiperson.h
index f3ff940e1..afd2213d5 100644
--- a/libretroshare/src/pqi/pqiperson.h
+++ b/libretroshare/src/pqi/pqiperson.h
@@ -29,6 +29,7 @@
 #define MRK_PQI_PERSON_HEADER
 
 
+#include <string>
 #include "pqi/pqi.h"
 #include "util/rsnet.h"
 
@@ -66,7 +67,7 @@ public:
     	virtual int 	reset() { pqistreamer::reset(); return ni->reset(); }
 	virtual int 	disconnect() { return reset() ; }
 	virtual bool connect_parameter(uint32_t type, uint32_t value) { return ni->connect_parameter(type, value);}
-	virtual bool connect_parameter(uint32_t type, std::string value) { return ni->connect_parameter(type, value);}
+	virtual bool connect_parameter(uint32_t type, const std::string &value) { return ni->connect_parameter(type, value);}
 	virtual bool connect_additional_address(uint32_t type, const struct sockaddr_storage &addr) { return ni->connect_additional_address(type, addr); }
 	virtual int getConnectAddress(struct sockaddr_storage &raddr){ return ni->getConnectAddress(raddr); }