diff --git a/lib/generators/rails_admin/importmap_formatter.rb b/lib/generators/rails_admin/importmap_formatter.rb
index 1d2fdc6ffd..6b40080f2b 100644
--- a/lib/generators/rails_admin/importmap_formatter.rb
+++ b/lib/generators/rails_admin/importmap_formatter.rb
@@ -18,7 +18,7 @@ def format
 
       # Tidy up jQuery UI dependencies
       jquery_uis = imports.keys.filter { |key, _| key =~ /jquery-ui/ }
-      imports['jquery-ui/'] = imports[jquery_uis.first].gsub(%r{(/[^@]+)+$}, '/')
+      imports['jquery-ui/'] = imports[jquery_uis.first].gsub(%r{(@[^/@]+)/[^@]+$}, '\1/')
       imports.reject! { |key, _| jquery_uis.include? key }
 
       pins = ['pin "rails_admin", preload: true', packager.pin_for('rails_admin/src/rails_admin/base', imports.delete('rails_admin'))]