diff --git a/src/libs/qtlibs/config.h b/src/libs/qtlibs/config.h
index 17f0a4d1d390fd4e9fa0606014b0088c13501623..190c2c7d41d6fe2fa1e1b72e0f42a9d313dc3eeb 100644
--- a/src/libs/qtlibs/config.h
+++ b/src/libs/qtlibs/config.h
@@ -21,7 +21,7 @@ class Config : public QObject
     Q_OBJECT
 
 public:
-    explicit Config(const QString &configDirPath = QString(), QObject *parent = 0);
+    explicit Config(const QString &configDirPath = "", QObject *parent = 0);
 
     Config(const Config &other, QObject *parent = 0);
     Config &operator =(const Config &other);
diff --git a/src/libs/qtlibs/dir.h b/src/libs/qtlibs/dir.h
index ca98375003679b22d7f710b8b2dcf67a326c2613..aa3dfe15369a49bf5bfd49e87a92ddaaa54a6554 100644
--- a/src/libs/qtlibs/dir.h
+++ b/src/libs/qtlibs/dir.h
@@ -21,7 +21,7 @@ class Dir : public QObject
     Q_OBJECT
 
 public:
-    explicit Dir(const QString &path = QString(), QObject *parent = 0);
+    explicit Dir(const QString &path = "", QObject *parent = 0);
 
     Dir(const Dir &other, QObject *parent = 0);
     Dir &operator =(const Dir &other);
diff --git a/src/libs/qtlibs/file.h b/src/libs/qtlibs/file.h
index dab67a8a5049f740724705d84069d4b5929ef9fe..d9a77830189e8d51fc4595eb0ee07450e31ff2d0 100644
--- a/src/libs/qtlibs/file.h
+++ b/src/libs/qtlibs/file.h
@@ -20,7 +20,7 @@ class File : public QObject
     Q_OBJECT
 
 public:
-    explicit File(const QString &path = QString(), QObject *parent = 0);
+    explicit File(const QString &path = "", QObject *parent = 0);
 
     File(const File &other, QObject *parent = 0);
     File &operator =(const File &other);
diff --git a/src/libs/qtlibs/networkresource.cpp b/src/libs/qtlibs/networkresource.cpp
index 1e11226eb77f3ebf5506718b07822f519a9af4af..ddf879c4fbf3ac5bc4a532d54e60f46bd6c7c355 100644
--- a/src/libs/qtlibs/networkresource.cpp
+++ b/src/libs/qtlibs/networkresource.cpp
@@ -17,7 +17,7 @@
 
 namespace qtlibs {
 
-NetworkResource::NetworkResource(const QString &name, const QUrl &url, const bool &async, QObject *parent)
+NetworkResource::NetworkResource(const QString &name, const QUrl &url, bool async, QObject *parent)
     : QObject(parent), name_(name), url_(url), async_(async)
 {
     setManager(new QNetworkAccessManager(this));
@@ -72,7 +72,7 @@ bool NetworkResource::async() const
     return async_;
 }
 
-void NetworkResource::setAsync(const bool &async)
+void NetworkResource::setAsync(bool async)
 {
     async_ = async;
 }
@@ -182,7 +182,7 @@ void NetworkResource::setMethod(const QString &method)
     method_ = method;
 }
 
-NetworkResource *NetworkResource::send(const bool &async, const QNetworkRequest &request)
+NetworkResource *NetworkResource::send(bool async, const QNetworkRequest &request)
 {
     if (method() == "HEAD") {
         setReply(manager()->head(request));
diff --git a/src/libs/qtlibs/networkresource.h b/src/libs/qtlibs/networkresource.h
index 72a3e3580e719696f7eb3fa9b2cb1e817742a17c..1a4c73bc58ccb8caf4c197bcdced28570c0b4bc1 100644
--- a/src/libs/qtlibs/networkresource.h
+++ b/src/libs/qtlibs/networkresource.h
@@ -24,7 +24,7 @@ class NetworkResource : public QObject
     Q_OBJECT
 
 public:
-    explicit NetworkResource(const QString &name = QString(), const QUrl &url = QUrl(), const bool &async = true, QObject *parent = 0);
+    explicit NetworkResource(const QString &name = "", const QUrl &url = QUrl(), bool async = true, QObject *parent = 0);
     ~NetworkResource();
 
     NetworkResource(const NetworkResource &other, QObject *parent = 0);
@@ -35,7 +35,7 @@ public:
     QUrl url() const;
     void setUrl(const QUrl &url);
     bool async() const;
-    void setAsync(const bool &async);
+    void setAsync(bool async);
     QNetworkRequest request() const;
     void setRequest(const QNetworkRequest &request);
     QNetworkAccessManager *manager() const;
@@ -62,7 +62,7 @@ private:
     void setReply(QNetworkReply *reply);
     void setMethod(const QString &method);
 
-    NetworkResource *send(const bool &async, const QNetworkRequest &request);
+    NetworkResource *send(bool async, const QNetworkRequest &request);
 
     QString name_;
     QUrl url_;
diff --git a/src/libs/qtlibs/package.h b/src/libs/qtlibs/package.h
index fd7422f2cf268c39d95b6f2eac50bd7f48079fc8..077a8cdddbba17acd4e4f40bc83526bcc4ab7969 100644
--- a/src/libs/qtlibs/package.h
+++ b/src/libs/qtlibs/package.h
@@ -20,7 +20,7 @@ class Package : public QObject
     Q_OBJECT
 
 public:
-    explicit Package(const QString &path = QString(), QObject *parent = 0);
+    explicit Package(const QString &path = "", QObject *parent = 0);
 
     Package(const Package &other, QObject *parent = 0);
     Package &operator =(const Package &other);