diff --git a/src/plugins/studiowelcome/screensizemodel.h b/src/plugins/studiowelcome/screensizemodel.h
index e01f17295c5..4e38f7acf85 100644
--- a/src/plugins/studiowelcome/screensizemodel.h
+++ b/src/plugins/studiowelcome/screensizemodel.h
@@ -67,7 +67,7 @@ public:
         return QSize{width, height};
     }
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const override
+    int rowCount(const QModelIndex &/*parent*/) const override
     {
         if (m_backendModel)
             return m_backendModel->rowCount();
@@ -75,7 +75,7 @@ public:
         return 0;
     }
 
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
+    QVariant data(const QModelIndex &index, int /*role*/) const override
     {
         if (m_backendModel) {
             auto *item = m_backendModel->item(index.row(), index.column());
diff --git a/src/plugins/studiowelcome/stylemodel.h b/src/plugins/studiowelcome/stylemodel.h
index 6d6d09620d1..e311eded6fb 100644
--- a/src/plugins/studiowelcome/stylemodel.h
+++ b/src/plugins/studiowelcome/stylemodel.h
@@ -41,7 +41,7 @@ public:
     Q_INVOKABLE QString iconId(int index) const;
     Q_INVOKABLE void filter(const QString &what = "all");
 
-    int rowCount(const QModelIndex &parent = QModelIndex()) const override
+    int rowCount(const QModelIndex &/*parent*/) const override
     {
         if (m_backendModel)
             return static_cast<int>(m_filteredItems.size());
@@ -49,7 +49,7 @@ public:
         return 0;
     }
 
-    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override
+    QVariant data(const QModelIndex &index, int /*role*/) const override
     {
         if (m_backendModel) {
             auto *item = m_filteredItems.at(index.row());