diff --git a/src/CppParser/AST.h b/src/CppParser/AST.h
index 7f5905ef..6658ae63 100644
--- a/src/CppParser/AST.h
+++ b/src/CppParser/AST.h
@@ -300,6 +300,8 @@ struct PreprocessedEntity;
 
 struct CS_API Declaration
 {
+    Declaration();
+
     AccessSpecifier Access;
     DeclarationContext* _Namespace;
     std::string Name;