diff --git a/src/Bridge/ASTVisitor.cs b/src/Bridge/ASTVisitor.cs
index 0bdebd89..f46440fa 100644
--- a/src/Bridge/ASTVisitor.cs
+++ b/src/Bridge/ASTVisitor.cs
@@ -176,7 +176,7 @@ namespace Cxxi
             return true;
         }
 
-        public bool VisitNamespace(Namespace @namespace)
+        public virtual bool VisitNamespace(Namespace @namespace)
         {
             foreach (var decl in @namespace.Classes)
                 decl.Visit(this);