diff --git a/include/CrossLang.hpp b/include/CrossLang.hpp
index 6e24e66..d5fbfe9 100644
--- a/include/CrossLang.hpp
+++ b/include/CrossLang.hpp
@@ -996,6 +996,8 @@ class GC {
             TObject GetCurrent(GCList& ls);
             void Mark();
     };
+    class TDynamicList;
+    class TDynamicDictionary;
     class TDynamicListEnumerator : public TEnumerator 
     {
         int64_t index;