diff --git a/template/docroot/sites/default/settings.php b/template/docroot/sites/default/settings.php
index 13301d84ff..fb113da191 100755
--- a/template/docroot/sites/default/settings.php
+++ b/template/docroot/sites/default/settings.php
@@ -700,4 +700,5 @@
  */
 
 // Include BLT configuration.
-require_once DRUPAL_ROOT . '/sites/default/settings/blt.settings.php';
+// Do not change to require_once(). @see https://github.com/acquia/blt/issues/345
+require DRUPAL_ROOT . '/sites/default/settings/blt.settings.php';
diff --git a/template/docroot/sites/default/settings/blt.settings.php b/template/docroot/sites/default/settings/blt.settings.php
index 5dd482d754..2fcbaad7ea 100644
--- a/template/docroot/sites/default/settings/blt.settings.php
+++ b/template/docroot/sites/default/settings/blt.settings.php
@@ -1,26 +1,26 @@
 <?php
 
 // Includes required Acquia configuration and set $base_url correctly.
-require_once DRUPAL_ROOT . '/sites/default/settings/base.settings.php';
+require DRUPAL_ROOT . '/sites/default/settings/base.settings.php';
 
 // Includes caching configuration.
-require_once DRUPAL_ROOT . '/sites/default/settings/cache.settings.php';
+require DRUPAL_ROOT . '/sites/default/settings/cache.settings.php';
 
 // Includes logging configuration.
-require_once DRUPAL_ROOT . '/sites/default/settings/logging.settings.php';
+require DRUPAL_ROOT . '/sites/default/settings/logging.settings.php';
 
 
 /**
  * Acquia Cloud settings.
  */
 if ($is_ah_env && file_exists('/var/www/site-php')) {
-  require_once "/var/www/site-php/{$_ENV['AH_SITE_GROUP']}/{$_ENV['AH_SITE_GROUP']}-settings.inc";
+  require "/var/www/site-php/{$_ENV['AH_SITE_GROUP']}/{$_ENV['AH_SITE_GROUP']}-settings.inc";
 
   // Store API Keys and things outside of version control.
   // @see settings/sample-secrets.settings.php for sample code.
   $secrets_file = sprintf('/mnt/gfs/%s.%s/secrets.settings.php', $_ENV['AH_SITE_GROUP'], $_ENV['AH_SITE_ENVIRONMENT']);
   if (file_exists($secrets_file)) {
-    require_once $secrets_file;
+    require $secrets_file;
   }
 }
 
@@ -37,19 +37,19 @@
 if ($is_local_env) {
   // Load local machine settings.
   if (file_exists(DRUPAL_ROOT . '/sites/default/settings/local.settings.php')) {
-    require_once DRUPAL_ROOT . '/sites/default/settings/local.settings.php';
+    require DRUPAL_ROOT . '/sites/default/settings/local.settings.php';
   }
 
   // Load Acquia Pipeline settings.
   if (getenv('PIPELINE_ENV') && file_exists(DRUPAL_ROOT . '/sites/default/settings/pipelines.settings.php')) {
-    require_once DRUPAL_ROOT . '/sites/default/settings/pipelines.settings.php';
+    require DRUPAL_ROOT . '/sites/default/settings/pipelines.settings.php';
   }
   // Load Travis CI settings.
   elseif (getenv('TRAVIS') && file_exists(DRUPAL_ROOT . '/sites/default/settings/travis.settings.php')) {
-    require_once DRUPAL_ROOT . '/sites/default/settings/travis.settings.php';
+    require DRUPAL_ROOT . '/sites/default/settings/travis.settings.php';
   }
   // Load Tugboat settings.
   elseif (getenv('TUGBOAT_URL') && file_exists(DRUPAL_ROOT . '/sites/default/settings/tugboat.settings.php')) {
-    require_once DRUPAL_ROOT . '/sites/default/settings/tugboat.settings.php';
+    require DRUPAL_ROOT . '/sites/default/settings/tugboat.settings.php';
   }
 }