diff --git a/core/includes/common.inc b/core/includes/common.inc
index d3e2dba..3a73b92 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -2680,7 +2680,7 @@ function drupal_add_library($library_name, $every_page = NULL) {
   list($extension, $name) = explode('/', $library_name, 2);
   // Only process the library if it exists and it was not added already.
   if (!isset($added[$extension][$name])) {
-    if ($library = $library_discovery->getLibraryByName($module, $name)) {
+    if ($library = $library_discovery->getLibraryByName($extension, $name)) {
       // Allow modules and themes to dynamically attach request and context
       // specific data for this library; e.g., localization.
       \Drupal::moduleHandler()->alter('library', $library, $library_name);