diff --git a/core/modules/rdf/rdf.module b/core/modules/rdf/rdf.module
index d09886bcbb..d8cdb2f490 100644
--- a/core/modules/rdf/rdf.module
+++ b/core/modules/rdf/rdf.module
@@ -10,6 +10,16 @@
 use Drupal\Core\Template\Attribute;
 use Drupal\rdf\Entity\RdfMapping;
 
+/**
+ * Overrides for easyrdf/easyrdf dev-master (PHP 7.4 compatibility).
+ * @todo remove in Drupal 9.
+ */
+if (class_exists('\EasyRdf\Parser\Rdfa')) {
+  class_alias('\EasyRdf\Parser\Rdfa', '\EasyRdf_Parser_Rdfa');
+  class_alias('\EasyRdf\Graph', '\EasyRdf_Graph');
+  class_alias('\EasyRdf\Resource', '\EasyRdf_Resource');
+}
+
 /**
  * Implements hook_help().
  */