diff --git a/src/core/models/entityorderproxymodel.h b/src/core/models/entityorderproxymodel.h
--- a/src/core/models/entityorderproxymodel.h
+++ b/src/core/models/entityorderproxymodel.h
@@ -61,7 +61,7 @@
     /**
      * Sets the config @p group that will be used for storing the order.
      */
-    void setOrderConfig(KConfigGroup &group);
+    void setOrderConfig(const KConfigGroup &group);
 
     /**
      * Saves the order.
diff --git a/src/core/models/entityorderproxymodel.cpp b/src/core/models/entityorderproxymodel.cpp
--- a/src/core/models/entityorderproxymodel.cpp
+++ b/src/core/models/entityorderproxymodel.cpp
@@ -68,7 +68,7 @@
     delete d_ptr;
 }
 
-void EntityOrderProxyModel::setOrderConfig(KConfigGroup &configGroup)
+void EntityOrderProxyModel::setOrderConfig(const KConfigGroup &configGroup)
 {
     Q_D(EntityOrderProxyModel);
     Q_EMIT layoutAboutToBeChanged();