diff --git a/includes/htmlform/HTMLForm.php b/includes/htmlform/HTMLForm.php
index d582da3b9d1..4b8b5a026c5 100644
--- a/includes/htmlform/HTMLForm.php
+++ b/includes/htmlform/HTMLForm.php
@@ -1051,6 +1051,14 @@ class HTMLForm extends ContextSource {
 		$this->mSubmitModifierClass = 'mw-ui-destructive';
 	}
 
+	/**
+	 * Identify that the submit button in the form has a progressive action
+	 *
+	 */
+	public function setSubmitProgressive() {
+		$this->mSubmitModifierClass = 'mw-ui-progressive';
+	}
+
 	/**
 	 * Set the text for the submit button to a message
 	 * @since 1.19
diff --git a/includes/specials/SpecialBlockList.php b/includes/specials/SpecialBlockList.php
index 456f4ecb5bb..aefd99ad41a 100644
--- a/includes/specials/SpecialBlockList.php
+++ b/includes/specials/SpecialBlockList.php
@@ -103,6 +103,7 @@ class SpecialBlockList extends SpecialPage {
 		$form->setMethod( 'get' );
 		$form->setWrapperLegendMsg( 'ipblocklist-legend' );
 		$form->setSubmitTextMsg( 'ipblocklist-submit' );
+		$form->setSubmitProgressive();
 		$form->prepareForm();
 
 		$form->displayForm( '' );