diff --git a/plugins/Cardinal/src/plugincontext.hpp b/plugins/Cardinal/src/plugincontext.hpp
index 935a007..c8c9208 100644
--- a/plugins/Cardinal/src/plugincontext.hpp
+++ b/plugins/Cardinal/src/plugincontext.hpp
@@ -31,7 +31,9 @@
 
 #ifndef HEADLESS
 START_NAMESPACE_DGL
-class NanoTopLevelWidget;
+class TopLevelWidget;
+template <class BaseWidget> class NanoBaseWidget;
+typedef NanoBaseWidget<TopLevelWidget> NanoTopLevelWidget;
 END_NAMESPACE_DGL
 #endif