diff --git a/src/libs/modelinglib/qmt/infrastructure/ioexceptions.h b/src/libs/modelinglib/qmt/infrastructure/ioexceptions.h
index cba138b0563..fc5eb73917d 100644
--- a/src/libs/modelinglib/qmt/infrastructure/ioexceptions.h
+++ b/src/libs/modelinglib/qmt/infrastructure/ioexceptions.h
@@ -38,7 +38,7 @@ public:
 class FileIOException : public IOException
 {
 public:
-    explicit FileIOException(const QString &errorMsg, const QString &fileName = QString::null,
+    explicit FileIOException(const QString &errorMsg, const QString &fileName = QString(),
                              int lineNumber = -1);
 
     QString fileName() const { return m_fileName; }
diff --git a/src/libs/qmljs/qmljsrewriter.cpp b/src/libs/qmljs/qmljsrewriter.cpp
index 4e70a26b4a0..b672f8df868 100644
--- a/src/libs/qmljs/qmljsrewriter.cpp
+++ b/src/libs/qmljs/qmljsrewriter.cpp
@@ -220,7 +220,7 @@ UiObjectMemberList *Rewriter::searchMemberToInsertAfter(UiObjectMemberList *memb
         else if (UiObjectBinding *objectBinding = cast<UiObjectBinding*>(member))
             orderedMembers[toString(objectBinding->qualifiedId)] = iter;
         else if (cast<UiObjectDefinition*>(member))
-            orderedMembers[QString::null] = iter;
+            orderedMembers[QString()] = iter;
         else if (UiScriptBinding *scriptBinding = cast<UiScriptBinding*>(member))
             orderedMembers[toString(scriptBinding->qualifiedId)] = iter;
         else if (cast<UiPublicMember*>(member))
@@ -517,7 +517,7 @@ void Rewriter::includeEmptyGroupedProperty(UiObjectDefinition *groupedProperty,
 #if 0
 UiObjectMemberList *QMLRewriter::searchMemberToInsertAfter(UiObjectMemberList *members, const QStringList &propertyOrder)
 {
-    const int objectDefinitionInsertionPoint = propertyOrder.indexOf(QString::null);
+    const int objectDefinitionInsertionPoint = propertyOrder.indexOf(QString());
 
     UiObjectMemberList *lastObjectDef = 0;
     UiObjectMemberList *lastNonObjectDef = 0;
@@ -562,7 +562,7 @@ UiObjectMemberList *QMLRewriter::searchMemberToInsertAfter(UiObjectMemberList *m
         else if (UiObjectBinding *objectBinding = cast<UiObjectBinding*>(member))
             orderedMembers[toString(objectBinding->qualifiedId)] = iter;
         else if (cast<UiObjectDefinition*>(member))
-            orderedMembers[QString::null] = iter;
+            orderedMembers[QString()] = iter;
         else if (UiScriptBinding *scriptBinding = cast<UiScriptBinding*>(member))
             orderedMembers[toString(scriptBinding->qualifiedId)] = iter;
         else if (cast<UiPublicMember*>(member))
diff --git a/src/plugins/qmldesigner/designercore/filemanager/qmlrewriter.cpp b/src/plugins/qmldesigner/designercore/filemanager/qmlrewriter.cpp
index b5388afc59f..7777f3202c2 100644
--- a/src/plugins/qmldesigner/designercore/filemanager/qmlrewriter.cpp
+++ b/src/plugins/qmldesigner/designercore/filemanager/qmlrewriter.cpp
@@ -309,7 +309,7 @@ QmlJS::AST::UiObjectMemberList *QMLRewriter::searchMemberToInsertAfter(QmlJS::AS
         else if (auto objectBinding = QmlJS::AST::cast<QmlJS::AST::UiObjectBinding*>(member))
             orderedMembers[toString(objectBinding->qualifiedId)] = iter;
         else if (QmlJS::AST::cast<QmlJS::AST::UiObjectDefinition*>(member))
-            orderedMembers[QString::null] = iter;
+            orderedMembers[QString()] = iter;
         else if (auto scriptBinding = QmlJS::AST::cast<QmlJS::AST::UiScriptBinding*>(member))
             orderedMembers[toString(scriptBinding->qualifiedId)] = iter;
         else if (QmlJS::AST::cast<QmlJS::AST::UiPublicMember*>(member))
diff --git a/src/plugins/qmljseditor/quicktoolbar.cpp b/src/plugins/qmljseditor/quicktoolbar.cpp
index 3122c43ceda..41c1bea1146 100644
--- a/src/plugins/qmljseditor/quicktoolbar.cpp
+++ b/src/plugins/qmljseditor/quicktoolbar.cpp
@@ -96,7 +96,7 @@ QuickToolBar::QuickToolBar()
                << QLatin1String("font.italic")
                << QLatin1String("font.underline")
                << QLatin1String("font.strikeout")
-               << QString::null
+               << QString()
                << QLatin1String("states")
                << QLatin1String("transitions")
                ;