--- a/main/src/core/Mono.Texteditor/Mono.TextEditor/GtkWorkarounds.cs
+++ b/main/src/core/Mono.Texteditor/Mono.TextEditor/GtkWorkarounds.cs
@@ -686,8 +686,10 @@ namespace Mono.TextEditor
                        il.Emit (OpCodes.Ldloc, loc_obj);
                        il.Emit (OpCodes.Brfalse, IL_002b);

+                       var tref = typeof (GLib.Object).Assembly.GetType ("GLib.ToggleRef");
                        il.Emit (OpCodes.Ldloc, loc_obj);
-                       il.Emit (OpCodes.Callvirt, typeof (GLib.Object).Assembly.GetType ("GLib.ToggleRef").GetProperty ("Target")
+                       il.Emit (OpCodes.Castclass, tref);
+                       il.Emit (OpCodes.Callvirt, tref.GetProperty ("Target").GetGetMethod ());
                        il.Emit (OpCodes.Isinst, typeof (Gtk.Container));
                        il.Emit (OpCodes.Stloc, loc_container);