diff -ru old/libunity/src/unity-aggregator-scope.vala libunity/src/unity-aggregator-scope.vala
--- old/libunity/src/unity-aggregator-scope.vala	1969-12-31 19:00:01.000000000 -0500
+++ libunity/src/unity-aggregator-scope.vala	2019-09-21 17:06:12.663864891 -0400
@@ -51,7 +51,7 @@
    */
   public abstract int category_index_for_scope_id (string scope_id);
 
-  public AggregatorScope (string dbus_path_, string id_, MergeMode merge_mode = AggregatorScope.MergeMode.OWNER_SCOPE, bool proxy_filter_hints = false)
+  protected AggregatorScope (string dbus_path_, string id_, MergeMode merge_mode = AggregatorScope.MergeMode.OWNER_SCOPE, bool proxy_filter_hints = false)
   {
     Object (dbus_path: dbus_path_, id: id_, is_master: true,
             merge_mode: merge_mode, proxy_filter_hints: proxy_filter_hints);
diff -ru old/libunity/src/unity-deprecated-scope.vala libunity/src/unity-deprecated-scope.vala
--- old/libunity/src/unity-deprecated-scope.vala	1969-12-31 19:00:01.000000000 -0500
+++ libunity/src/unity-deprecated-scope.vala	2019-09-21 17:06:39.721627805 -0400
@@ -61,7 +61,7 @@
   internal CategorySet _categories;
   internal FilterSet _filters;
    
-  public DeprecatedScopeBase (string dbus_path_, string id_)
+  protected DeprecatedScopeBase (string dbus_path_, string id_)
   {
     Object (dbus_path: dbus_path_, id: id_);
   }
diff -ru old/libunity/tools/preview-renderer.vala libunity/tools/preview-renderer.vala
--- old/libunity/tools/preview-renderer.vala	1969-12-31 19:00:01.000000000 -0500
+++ libunity/tools/preview-renderer.vala	2019-09-21 17:09:16.201522110 -0400
@@ -63,7 +63,7 @@
      */
     public abstract class GridRenderer: PreviewRenderer
     {
-        public GridRenderer()
+        protected GridRenderer()
         {
             Object();
         }