diff --git a/src/libcalamares/locale/LabelModel.cpp b/src/libcalamares/locale/LabelModel.cpp
index 312d96121..90475cb0e 100644
--- a/src/libcalamares/locale/LabelModel.cpp
+++ b/src/libcalamares/locale/LabelModel.cpp
@@ -63,7 +63,7 @@ LabelModel::data( const QModelIndex& index, int role ) const
 }
 
 const Label&
-LabelModel::locale( int row )
+LabelModel::locale( int row ) const
 {
     if ( ( row < 0 ) || ( row >= m_locales.count() ) )
     {
diff --git a/src/libcalamares/locale/LabelModel.h b/src/libcalamares/locale/LabelModel.h
index 092ee638a..c807e6016 100644
--- a/src/libcalamares/locale/LabelModel.h
+++ b/src/libcalamares/locale/LabelModel.h
@@ -51,7 +51,7 @@ public:
      * This is the backing data for the model; if @p row is out-of-range,
      * returns a reference to en_US.
      */
-    const Label& locale( int row );
+    const Label& locale( int row ) const;
 
     /** @brief Searches for an item that matches @p predicate
      *