diff --git a/defaults/install/drupal/settings.build-acquia.php b/defaults/install/drupal/settings.build-acquia.php
index cb1c4e79..055ce6a7 100644
--- a/defaults/install/drupal/settings.build-acquia.php
+++ b/defaults/install/drupal/settings.build-acquia.php
@@ -10,7 +10,7 @@
 
 $settings['file_public_path'] = '${drupal.site.settings.file_public_path}';
 $settings['file_private_path'] = "/mnt/gfs/{$_ENV['AH_SITE_GROUP']}.{$_ENV['AH_SITE_ENVIRONMENT']}/files-private";
-$config['system.file']['path']['temporary'] = $_ENV['TEMP'];
+$settings['file_temp_path'] = $_ENV['TEMP'];
 
 $settings['config_sync_directory'] = '${drupal.site.config_sync_directory}';
 
diff --git a/defaults/install/drupal/settings.build-platformsh.php b/defaults/install/drupal/settings.build-platformsh.php
index 43702a5a..ba04580e 100644
--- a/defaults/install/drupal/settings.build-platformsh.php
+++ b/defaults/install/drupal/settings.build-platformsh.php
@@ -7,6 +7,9 @@
 
 $settings['config_sync_directory'] = '${drupal.site.config_sync_directory}';
 
+// Use the temporary directory set up in .platform.app.yaml
+$settings['file_temp_path'] = '/tmp';
+
 // Enable/disable config_split configurations.
 if (isset($_ENV['PLATFORM_BRANCH'])) {
   if ($_ENV['PLATFORM_BRANCH'] == 'master') {
diff --git a/defaults/install/drupal/settings.build.php b/defaults/install/drupal/settings.build.php
index 45cbd9be..5287f758 100644
--- a/defaults/install/drupal/settings.build.php
+++ b/defaults/install/drupal/settings.build.php
@@ -23,6 +23,10 @@
 $settings['file_public_path'] = '${drupal.site.settings.file_public_path}';
 $settings['file_private_path'] = '${drupal.site.settings.file_private_path}';
 
+// Use the standard temporary directory on the development environment (update if the
+// project's development environment is configured differently).
+$settings['file_temp_path'] = '/tmp';
+
 // Enable/disable config_split configurations. To simulate other config split
 // environments, change "development" to either "staging" or "production", then run:
 //   drush cr && drush cim -y