diff --git a/includes/InputBox.php b/includes/InputBox.php
index 9f31a563..22bd5444 100644
--- a/includes/InputBox.php
+++ b/includes/InputBox.php
@@ -97,6 +97,7 @@ class InputBox {
 			'ext.inputBox.styles',
 			'mediawiki.ui.input',
 			'mediawiki.ui.checkbox',
+			'mediawiki.ui.button',
 		] );
 	}