diff --git a/source/MaterialXCore/Document.h b/source/MaterialXCore/Document.h
index 45214a4429..90d6faf8fe 100644
--- a/source/MaterialXCore/Document.h
+++ b/source/MaterialXCore/Document.h
@@ -709,9 +709,10 @@ class MX_CORE_API Document : public GraphElement
 
   private:
     class Cache;
-    std::unique_ptr<Cache> _cache;
-    // Data library for the document
+
+  private:
     ConstDocumentPtr _dataLibrary;
+    std::unique_ptr<Cache> _cache;
 };
 
 /// Create a new Document.