diff --git a/core/modules/language/language.admin.inc b/core/modules/language/language.admin.inc
index 62e5d0c..2193d66 100644
--- a/core/modules/language/language.admin.inc
+++ b/core/modules/language/language.admin.inc
@@ -596,7 +596,7 @@ function language_negotiation_configure_form_submit($form, &$form_state) {
 
   // Clear block definitions cache since the available blocks and their names
   // may have been changed based on the configurable types.
-  if (module_exists('block')) {
+  if (Drupal::moduleHandler()->moduleExists('block')) {
     // If there is an active language switcher for a language type that has been
     // made not configurable, deactivate it first.
     $non_configurable = array_keys(array_diff($config_values, array_filter($config_values)));