diff --git a/src/plugins/projectexplorer/kitmanager.cpp b/src/plugins/projectexplorer/kitmanager.cpp
index 051a641afbd..57069ffcf11 100644
--- a/src/plugins/projectexplorer/kitmanager.cpp
+++ b/src/plugins/projectexplorer/kitmanager.cpp
@@ -496,16 +496,6 @@ Core::Id KitAspectWidget::kitInformationId() const
     return m_kitInformation->id();
 }
 
-bool KitAspectWidget::isMutable() const
-{
-    return m_kit->isMutable(m_kitInformation->id());
-}
-
-void KitAspectWidget::setMutable(bool b)
-{
-    m_kit->setMutable(m_kitInformation->id(), b);
-}
-
 QString KitAspectWidget::msgManage()
 {
     return tr("Manage...");
diff --git a/src/plugins/projectexplorer/kitmanager.h b/src/plugins/projectexplorer/kitmanager.h
index 439a392ec47..6d7ef227425 100644
--- a/src/plugins/projectexplorer/kitmanager.h
+++ b/src/plugins/projectexplorer/kitmanager.h
@@ -135,8 +135,6 @@ public:
     virtual QWidget *buttonWidget() const { return nullptr; }
 
     bool isSticky() const { return m_isSticky; }
-    bool isMutable() const;
-    void setMutable(bool b);
 
     static QString msgManage();
 
diff --git a/src/plugins/projectexplorer/kitmanagerconfigwidget.cpp b/src/plugins/projectexplorer/kitmanagerconfigwidget.cpp
index fa699708b78..2923b7a6f77 100644
--- a/src/plugins/projectexplorer/kitmanagerconfigwidget.cpp
+++ b/src/plugins/projectexplorer/kitmanagerconfigwidget.cpp
@@ -232,12 +232,13 @@ void KitManagerConfigWidget::addAspectToWorkingCopy(KitAspect *aspect)
 
     auto action = new QAction(tr("Mark as Mutable"), nullptr);
     action->setCheckable(true);
-    action->setChecked(widget->isMutable());
+    action->setChecked(workingCopy()->isMutable(aspect->id()));
+
     action->setEnabled(!widget->isSticky());
     widget->mainWidget()->addAction(action);
     widget->mainWidget()->setContextMenuPolicy(Qt::ActionsContextMenu);
-    connect(action, &QAction::toggled, this, [this, widget, action] {
-        widget->setMutable(action->isChecked());
+    connect(action, &QAction::toggled, this, [this, aspect, action] {
+        workingCopy()->setMutable(aspect->id(), action->isChecked());
         emit dirty();
     });