diff --git a/src/components/markdown-renderer/markdown-extension/plantuml/plantuml-markdown-extension.ts b/src/components/markdown-renderer/markdown-extension/plantuml/plantuml-markdown-extension.ts
index aabf2f104..f50ff8b14 100644
--- a/src/components/markdown-renderer/markdown-extension/plantuml/plantuml-markdown-extension.ts
+++ b/src/components/markdown-renderer/markdown-extension/plantuml/plantuml-markdown-extension.ts
@@ -40,6 +40,10 @@ export class PlantumlMarkdownExtension extends MarkdownExtension {
     }
   }
 
+  public buildTagNameWhitelist(): string[] {
+    return ['plantuml-not-configured']
+  }
+
   buildReplacers(): ComponentReplacer[] {
     return [new PlantumlNotConfiguredComponentReplacer()]
   }