diff --git a/src/Plugin/facets/widget/CheckboxWidget.php b/src/Plugin/facets/widget/CheckboxWidget.php
index bb71fed..27382ab 100644
--- a/src/Plugin/facets/widget/CheckboxWidget.php
+++ b/src/Plugin/facets/widget/CheckboxWidget.php
@@ -90,6 +90,8 @@ class CheckboxWidget implements WidgetInterface, FormInterface {
   public function buildForm(array $form, FormStateInterface $form_state) {
 
     /** @var \Drupal\facets\FacetInterface $facet */
+    // Get the facet form the build info, see the remark in ::build to know
+    // where this comes from.
     $build_info = $form_state->getBuildInfo();
     $facet = $build_info['args'][0];
 
@@ -157,15 +159,20 @@ class CheckboxWidget implements WidgetInterface, FormInterface {
       }
     }
 
-    // We have an active item, so redirecting to that page.
+    // We have an active item, so we redirect to the page that has that facet
+    // selected. This should be an absolute link because RedirectResponse is a
+    // symfony class that requires a full URL.
     if ($result_link instanceof Url) {
       $result_link->setAbsolute();
       $form_state->setResponse(new RedirectResponse($result_link->toString()));
       return;
     }
 
-    // Form was submitted, but nothing was selected, so we should submit to the
-    // facet.
-    $form_state->setResponse(new RedirectResponse('/' . $facet->getFacetSource()->getPath()));
+    // The form was submitted but nothing was active in the form, we should
+    // still redirect, but the url for the new page can't come from a result.
+    // So we're redirecting to the facet source's page.
+    $link = Url::fromUri($facet->getFacetSource()->getPath());
+    $link->setAbsolute();
+    $form_state->setResponse(new RedirectResponse($link->toString()));
   }
 }