diff --git a/entity_print.module b/entity_print.module
index b8e4e16..c9bf4ff 100644
--- a/entity_print.module
+++ b/entity_print.module
@@ -5,10 +5,12 @@
  * Print any entity.
  */
 
+use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Link;
+use Masterminds\HTML5;
 
 /**
  * Implements hook_theme().
@@ -92,3 +94,45 @@ function entity_print_form_entity_view_display_edit_form_submit(&$form, FormStat
     $display->save();
   }
 }
+
+/**
+ * Implements hook_entity_print_generate_html_alter().
+ *
+ * This is a temporary workaround for a core issue.
+ * @see https://drupal.org/node/1494670
+ */
+function entity_print_entity_print_generate_html_alter(&$html_string) {
+
+  // We only apply the fix to PHP Wkhtmltopdf because the other implementations
+  // allow us to specify a base url.
+  if (\Drupal::config('entity_print.settings')->get('pdf_engine') !== 'phpwkhtmltopdf') {
+    return;
+  }
+
+  $html5 = new HTML5();
+  $document = $html5->loadHTML($html_string);
+
+  // Define a function that will convert root relative uris into absolute urls.
+  $transform = function($tag, $attribute) use ($document) {
+    $base_url = \Drupal::request()->getSchemeAndHttpHost();
+    foreach ($document->getElementsByTagName($tag) as $node) {
+      $attribute_value = $node->getAttribute($attribute);
+
+      // Handle protocol agnostic URLs as well.
+      if (Unicode::substr($attribute_value, 0, 2) === '//') {
+        $node->setAttribute($attribute, $base_url . Unicode::substr($attribute_value, 1));
+      }
+      elseif (Unicode::substr($attribute_value, 0, 1) === '/') {
+        $node->setAttribute($attribute, $base_url . $attribute_value);
+      }
+    }
+  };
+  
+  // Transform stylesheets, links and images.
+  $transform('link', 'href');
+  $transform('a', 'href');
+  $transform('img', 'src');
+
+  // Overwrite the HTML.
+  $html_string = $html5->saveHTML($document);
+}
diff --git a/src/EntityPrintPdfBuilder.php b/src/EntityPrintPdfBuilder.php
index e3d7d94..c90ac65 100644
--- a/src/EntityPrintPdfBuilder.php
+++ b/src/EntityPrintPdfBuilder.php
@@ -226,7 +226,12 @@ class EntityPrintPdfBuilder implements PdfBuilderInterface {
     $rendered_css = $this->cssRenderer->render($css_assets);
     $render['#entity_print_css'] = $this->renderer->render($rendered_css);
 
-    return (string) $this->renderer->render($render);
+    $html = (string) $this->renderer->render($render);
+
+    // Allow other modules to alter the generated HTML.
+    $this->moduleHandler->alter('entity_print_generate_html', $html);
+
+    return $html;
   }
 
   /**