diff --git a/src/plugins/qt4projectmanager/qt4projectmanager.cpp b/src/plugins/qt4projectmanager/qt4projectmanager.cpp
index 3bb70668087..b217ac05e37 100644
--- a/src/plugins/qt4projectmanager/qt4projectmanager.cpp
+++ b/src/plugins/qt4projectmanager/qt4projectmanager.cpp
@@ -45,7 +45,6 @@
 #include <coreplugin/id.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/editormanager/ieditor.h>
-#include <coreplugin/variablemanager.h>
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/buildmanager.h>
 #include <projectexplorer/session.h>
@@ -76,9 +75,6 @@ using ProjectExplorer::FormType;
 using ProjectExplorer::ResourceType;
 using ProjectExplorer::UnknownFileType;
 
-static const char kHostBins[] = "CurrentProject:QT_HOST_BINS";
-static const char kInstallBins[] = "CurrentProject:QT_INSTALL_BINS";
-
 // Known file types of a Qt 4 project
 static const char *qt4FileTypes[] = {
     "CppHeaderFiles",
@@ -138,15 +134,6 @@ void Qt4Manager::init()
 
     connect(Core::EditorManager::instance(), SIGNAL(currentEditorChanged(Core::IEditor*)),
             this, SLOT(editorChanged(Core::IEditor*)));
-
-    Core::VariableManager *vm = Core::VariableManager::instance();
-    vm->registerVariable(kHostBins,
-        tr("Full path to the host bin directory of the current project's Qt version."));
-    vm->registerVariable(kInstallBins,
-        tr("Full path to the target bin directory of the current project's Qt version."
-           " You probably want %1 instead.").arg(QString::fromLatin1(kHostBins)));
-    connect(vm, SIGNAL(variableUpdateRequested(QByteArray)),
-            this, SLOT(updateVariable(QByteArray)));
 }
 
 void Qt4Manager::editorChanged(Core::IEditor *editor)
@@ -188,27 +175,6 @@ void Qt4Manager::editorAboutToClose(Core::IEditor *editor)
     }
 }
 
-void Qt4Manager::updateVariable(const QByteArray &variable)
-{
-    if (variable == kHostBins || variable == kInstallBins) {
-        Qt4Project *qt4pro = qobject_cast<Qt4Project *>(ProjectExplorer::ProjectExplorerPlugin::currentProject());
-        if (!qt4pro) {
-            Core::VariableManager::instance()->remove(variable);
-            return;
-        }
-        QString value;
-        const QtSupport::BaseQtVersion *qtv = 0;
-        if (ProjectExplorer::Target *t = qt4pro->activeTarget())
-            qtv = QtSupport::QtKitInformation::qtVersion(t->kit());
-        else
-            qtv = QtSupport::QtKitInformation::qtVersion(ProjectExplorer::KitManager::instance()->defaultKit());
-
-        if (qtv)
-            value = qtv->qmakeProperty(variable == kHostBins ? "QT_HOST_BINS" : "QT_INSTALL_BINS");
-        Core::VariableManager::instance()->insert(variable, value);
-    }
-}
-
 void Qt4Manager::uiEditorContentsChanged()
 {
     // cast sender, get filename
diff --git a/src/plugins/qt4projectmanager/qt4projectmanager.h b/src/plugins/qt4projectmanager/qt4projectmanager.h
index 4c98027e287..63465d77a1a 100644
--- a/src/plugins/qt4projectmanager/qt4projectmanager.h
+++ b/src/plugins/qt4projectmanager/qt4projectmanager.h
@@ -106,7 +106,6 @@ private slots:
     void editorAboutToClose(Core::IEditor *editor);
     void uiEditorContentsChanged();
     void editorChanged(Core::IEditor*);
-    void updateVariable(const QByteArray &variable);
 
 private:
     QList<Qt4Project *> m_projects;
diff --git a/src/plugins/qtsupport/qtsupportplugin.cpp b/src/plugins/qtsupport/qtsupportplugin.cpp
index 1b773d1215f..08007f9d45a 100644
--- a/src/plugins/qtsupport/qtsupportplugin.cpp
+++ b/src/plugins/qtsupport/qtsupportplugin.cpp
@@ -38,12 +38,19 @@
 
 #include "gettingstartedwelcomepage.h"
 
+#include <coreplugin/variablemanager.h>
 #include <extensionsystem/pluginmanager.h>
 #include <projectexplorer/kitmanager.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/projectexplorer.h>
+#include <projectexplorer/target.h>
 
 #include <QtPlugin>
 #include <QMenu>
 
+static const char kHostBins[] = "CurrentProject:QT_HOST_BINS";
+static const char kInstallBins[] = "CurrentProject:QT_INSTALL_BINS";
+
 using namespace QtSupport;
 using namespace QtSupport::Internal;
 
@@ -81,6 +88,15 @@ bool QtSupportPlugin::initialize(const QStringList &arguments, QString *errorMes
 
 void QtSupportPlugin::extensionsInitialized()
 {
+    Core::VariableManager *vm = Core::VariableManager::instance();
+    vm->registerVariable(kHostBins,
+        tr("Full path to the host bin directory of the current project's Qt version."));
+    vm->registerVariable(kInstallBins,
+        tr("Full path to the target bin directory of the current project's Qt version."
+           " You probably want %1 instead.").arg(QString::fromLatin1(kHostBins)));
+    connect(vm, SIGNAL(variableUpdateRequested(QByteArray)),
+            this, SLOT(updateVariable(QByteArray)));
+
     QtVersionManager::instance()->extensionsInitialized();
     ProjectExplorer::KitManager::instance()->registerKitInformation(new QtKitInformation);
 }
@@ -90,4 +106,25 @@ bool QtSupportPlugin::delayedInitialize()
     return QtVersionManager::instance()->delayedInitialize();
 }
 
+void QtSupportPlugin::updateVariable(const QByteArray &variable)
+{
+    if (variable != kHostBins && variable != kInstallBins)
+        return;
+
+    ProjectExplorer::Project *project = ProjectExplorer::ProjectExplorerPlugin::currentProject();
+    if (!project || !project->activeTarget()) {
+        Core::VariableManager::instance()->remove(variable);
+        return;
+    }
+
+    const BaseQtVersion *qtVersion = QtKitInformation::qtVersion(project->activeTarget()->kit());
+    if (!qtVersion) {
+        Core::VariableManager::instance()->remove(variable);
+        return;
+    }
+
+    QString value = qtVersion->qmakeProperty(variable == kHostBins ? "QT_HOST_BINS" : "QT_INSTALL_BINS");
+    Core::VariableManager::instance()->insert(variable, value);
+}
+
 Q_EXPORT_PLUGIN(QtSupportPlugin)
diff --git a/src/plugins/qtsupport/qtsupportplugin.h b/src/plugins/qtsupport/qtsupportplugin.h
index b529c5335a9..8a5a24eb790 100644
--- a/src/plugins/qtsupport/qtsupportplugin.h
+++ b/src/plugins/qtsupport/qtsupportplugin.h
@@ -49,6 +49,8 @@ public:
     bool delayedInitialize();
 
 private slots:
+    void updateVariable(const QByteArray &variable);
+
 #ifdef WITH_TESTS
     void testQtOutputParser_data();
     void testQtOutputParser();