diff --git a/src/opnsense/mvc/app/controllers/OPNsense/Proxy/forms/dialogEditBlacklist.xml b/src/opnsense/mvc/app/controllers/OPNsense/Proxy/forms/dialogEditBlacklist.xml
index 6481348df..15ffa8894 100644
--- a/src/opnsense/mvc/app/controllers/OPNsense/Proxy/forms/dialogEditBlacklist.xml
+++ b/src/opnsense/mvc/app/controllers/OPNsense/Proxy/forms/dialogEditBlacklist.xml
@@ -23,6 +23,7 @@
         <type>text</type>
         <type>select_multiple</type>
         <style>tokenize</style>
+        <nbDropdownElements>300</nbDropdownElements>
         <help><![CDATA[select categories to use, leave empty for all. Categories are visible after initial download.]]></help>
     </field>
     <field>