diff --git a/build/js/IFrame.js b/build/js/IFrame.js
index 0d4e9de86..2b1e1e7bb 100644
--- a/build/js/IFrame.js
+++ b/build/js/IFrame.js
@@ -142,7 +142,7 @@ class IFrame {
       return
     }
 
-    const uniqueName = link.replace('./', '').replace(/["&'./:=?[\]]/gi, '-').replace(/(--)/gi, '')
+    const uniqueName = link.replace('./', '').replace(/["#&'./:=?[\]]/gi, '-').replace(/(--)/gi, '')
     const navId = `tab-${uniqueName}`
 
     if (!this._config.allowDuplicates && $(`#${navId}`).length > 0) {