diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 2db037ecec..803299af70 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -847,18 +847,22 @@ function install_tasks($install_state) {
 
   // Now add any tasks defined by the installation profile.
   if (!empty($install_state['parameters']['profile'])) {
-    // Load the profile install file, because it is not always loaded when
-    // hook_install_tasks() is invoked (e.g. batch processing).
-    $profile = $install_state['parameters']['profile'];
-    $profile_install_file = $install_state['profiles'][$profile]->getPath() . '/' . $profile . '.install';
-    if (file_exists($profile_install_file)) {
-      include_once \Drupal::root() . '/' . $profile_install_file;
-    }
-    $function = $install_state['parameters']['profile'] . '_install_tasks';
-    if (function_exists($function)) {
-      $result = $function($install_state);
-      if (is_array($result)) {
-        $tasks += $result;
+    $profiles = \Drupal::service('extension.list.profile')->getAncestors($install_state['parameters']['profile']);
+    foreach (array_keys($profiles) as $profile_name) {
+      $profile = $install_state['profiles'][$profile_name];
+      // Load the profile install file, because it is not always loaded when
+      // hook_install_tasks() is invoked (e.g. batch processing).
+      $profile_install_file = $profile->getPath() . '/' . $profile_name . '.install';
+      if (file_exists($profile_install_file)) {
+        include_once \Drupal::root() . '/' . $profile_install_file;
+      }
+      // If this is a base profile then the profile isn't loaded
+      $function = $profile_name . '_install_tasks';
+      if (function_exists($function)) {
+        $result = $function($install_state);
+        if (is_array($result)) {
+          $tasks += $result;
+        }
       }
     }
   }
@@ -876,11 +880,13 @@ function install_tasks($install_state) {
 
   // Allow the installation profile to modify the full list of tasks.
   if (!empty($install_state['parameters']['profile'])) {
-    $profile = $install_state['parameters']['profile'];
-    if ($install_state['profiles'][$profile]->load()) {
-      $function = $install_state['parameters']['profile'] . '_install_tasks_alter';
-      if (function_exists($function)) {
-        $function($tasks, $install_state);
+    $profiles = \Drupal::service('extension.list.profile')->getAncestors($install_state['parameters']['profile']);
+    foreach (array_keys($profiles) as $profile_name) {
+      if ($install_state['profiles'][$profile_name]->load()) {
+        $function = $profile_name . '_install_tasks_alter';
+        if (function_exists($function)) {
+          $function($tasks, $install_state);
+        }
       }
     }
   }
@@ -1522,7 +1528,9 @@ function _install_get_version_info($version) {
  */
 function install_load_profile(&$install_state) {
   $profile = $install_state['parameters']['profile'];
-  $install_state['profiles'][$profile]->load();
+  foreach (array_keys(\Drupal::service('extension.list.profile')->getAncestors($profile)) as $profile_id) {
+    $install_state['profiles'][$profile_id]->load();
+  }
   $install_state['profile_info'] = install_profile_info($profile, isset($install_state['parameters']['langcode']) ? $install_state['parameters']['langcode'] : 'en');
 
   $sync_directory = Settings::get('config_sync_directory');