diff --git a/config/install/forward.settings.yml b/config/install/forward.settings.yml
index 647ff7b..e646b2a 100644
--- a/config/install/forward.settings.yml
+++ b/config/install/forward.settings.yml
@@ -26,7 +26,6 @@ forward_email_subject: '[forward:sender-name] has forwarded a page to you from [
 forward_email_message: '[forward:sender-name] thought you would like to see this page from the [site:name] web site.'
 forward_email_footer: ''
 forward_bypass_access_control: 0
-forward_filter_format: ''
 forward_filter_format_html: ''
 forward_filter_format_plain_text: ''
 forward_flood_control_limit: 10
diff --git a/forward.install b/forward.install
index ced4d56..7f5355a 100644
--- a/forward.install
+++ b/forward.install
@@ -136,3 +136,12 @@ function forward_update_8202() {
     ->set('forward_email_footer', '')
     ->save(TRUE);
 }
+
+/**
+ * Purge the stale configuration value for 'forward_filter_format'.
+ */
+function forward_update_8203() {
+  \Drupal::configFactory()->getEditable('forward.settings')
+    ->clear('forward_filter_format')
+    ->save();
+}