diff --git a/web/src/pages/agent/form/token-chunker-form/index.tsx b/web/src/pages/agent/form/token-chunker-form/index.tsx
index 2790d5d202..18fc217546 100644
--- a/web/src/pages/agent/form/token-chunker-form/index.tsx
+++ b/web/src/pages/agent/form/token-chunker-form/index.tsx
@@ -208,6 +208,7 @@ const TokenChunkerForm = ({
                 ))}
 
                 <BlockButton
+                  type="button"
                   onClick={() => childrenDelimiters.append({ value: '\n' })}
                 >
                   {t('common.add')}