diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
index de322eab51..f3fac96fce 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/tools/additional-contents.tt
@@ -635,6 +635,7 @@
                 force_p_newlines : false,
                 forced_root_block : '',
                 branding : false,
+                block_unsupported_drop : false,
                 relative_urls : false,
                 content_css : "[% interface | html %]/[% theme | html %]/css/tinymce.css",
                 menubar : "file edit view insert format tools table",