diff --git a/includes/emails/class-wc-email.php b/includes/emails/class-wc-email.php
index 44107557513..f94fd9e6e01 100644
--- a/includes/emails/class-wc-email.php
+++ b/includes/emails/class-wc-email.php
@@ -368,7 +368,7 @@ class WC_Email extends WC_Settings_API {
 	public function get_additional_content() {
 		$content = $this->get_option( 'additional_content', '' );
 
-		return apply_filters( 'woocommerce_email_additional_content_' . $this->id, $this->format_string( $content ), $this->object );
+		return apply_filters( 'woocommerce_email_additional_content_' . $this->id, $this->format_string( $content ), $this->object, $this );
 	}
 
 	/**