diff --git a/src/misc.h b/src/misc.h
index 7856fd27e..a4f1f1bd5 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -55,29 +55,29 @@ private:
   misc(); // Forbidden
 
 public:
-  static inline QString toQString(std::string str) {
+  static inline QString toQString(const std::string &str) {
     return QString::fromLocal8Bit(str.c_str());
   }
 
-  static inline QString toQString(char* str) {
+  static inline QString toQString(const char* str) {
     return QString::fromLocal8Bit(str);
   }
 
-  static inline QString toQStringU(std::string str) {
+  static inline QString toQStringU(const std::string &str) {
     return QString::fromUtf8(str.c_str());
   }
 
-  static inline QString toQStringU(char* str) {
+  static inline QString toQStringU(const char* str) {
     return QString::fromUtf8(str);
   }
 
-  static inline QString toQString(libtorrent::sha1_hash hash) {
+  static inline QString toQString(const libtorrent::sha1_hash &hash) {
     std::ostringstream o;
     o << hash;
     return QString(o.str().c_str());
   }
 
-  static inline libtorrent::sha1_hash toSha1Hash(QString hash) {
+  static inline libtorrent::sha1_hash toSha1Hash(const QString &hash) {
     return libtorrent::sha1_hash(qPrintable(hash));
   }
 
diff --git a/src/qtlibtorrent/qbtsession.cpp b/src/qtlibtorrent/qbtsession.cpp
index 654ce6a40..1b589cd9b 100644
--- a/src/qtlibtorrent/qbtsession.cpp
+++ b/src/qtlibtorrent/qbtsession.cpp
@@ -2375,7 +2375,7 @@ QHash<QString, TrackerInfos> QBtSession::getTrackersInfo(QString hash) const{
 }
 
 int QBtSession::getListenPort() const{
-  qDebug() << getListenPort() << s->listen_port();
+  qDebug() << Q_FUNC_INFO << s->listen_port();
   return s->listen_port();
 }