diff --git a/src/markdown-render.tsx b/src/markdown-render.tsx
index 3c68b48..3f37c87 100644
--- a/src/markdown-render.tsx
+++ b/src/markdown-render.tsx
@@ -39,7 +39,7 @@ const MarkdownRender = (props: MarkDownRenderProps) => {
       ...props.renderers,
     },
     plugins: [RemarkMathPlugin],
-    astPlugins: [AttachmentTransformer(props.attachments), ...props.astPlugins],
+    astPlugins: [AttachmentTransformer(props.attachments)].concat(props.astPlugins ? props.astPlugins : []),
   };
   return <ReactMarkdown {...newProps} />;
 };