diff --git a/src/TaskRunner/Commands/DrupalCommands.php b/src/TaskRunner/Commands/DrupalCommands.php
index 3d3b98e1e..e3ef8588c 100644
--- a/src/TaskRunner/Commands/DrupalCommands.php
+++ b/src/TaskRunner/Commands/DrupalCommands.php
@@ -620,8 +620,8 @@ protected function getToolkitSettingsBlock()
 \$settings['file_temp_path'] = getenv('DRUPAL_FILE_TEMP_PATH') !== FALSE ? getenv('DRUPAL_FILE_TEMP_PATH') : '/tmp';
 
 // Reverse proxy.
-if (intval(getenv('DRUPAL_REVERSE_PROXY_ENABLE')) === 1) {
-  \$settings['reverse_proxy'] = (bool) getenv('DRUPAL_REVERSE_PROXY_ENABLE');
+if (filter_var(getenv('DRUPAL_REVERSE_PROXY_ENABLE'), FILTER_VALIDATE_BOOLEAN)) {
+  \$settings['reverse_proxy'] = getenv('DRUPAL_REVERSE_PROXY_ENABLE');
   \$settings['reverse_proxy_addresses'] = explode(',', getenv('DRUPAL_REVERSE_PROXY_ADDRESSES'));
 }
 
diff --git a/tests/fixtures/commands/drupal-settings-setup.yml b/tests/fixtures/commands/drupal-settings-setup.yml
index 04dd76e26..11a2c17a5 100644
--- a/tests/fixtures/commands/drupal-settings-setup.yml
+++ b/tests/fixtures/commands/drupal-settings-setup.yml
@@ -40,8 +40,8 @@
         $settings['file_temp_path'] = getenv('DRUPAL_FILE_TEMP_PATH') !== FALSE ? getenv('DRUPAL_FILE_TEMP_PATH') : '/tmp';
 
         // Reverse proxy.
-        if (intval(getenv('DRUPAL_REVERSE_PROXY_ENABLE')) === 1) {
-          $settings['reverse_proxy'] = (bool) getenv('DRUPAL_REVERSE_PROXY_ENABLE');
+        if (filter_var(getenv('DRUPAL_REVERSE_PROXY_ENABLE'), FILTER_VALIDATE_BOOLEAN)) {
+          $settings['reverse_proxy'] = getenv('DRUPAL_REVERSE_PROXY_ENABLE');
           $settings['reverse_proxy_addresses'] = explode(',', getenv('DRUPAL_REVERSE_PROXY_ADDRESSES'));
         }
 
@@ -103,8 +103,8 @@
         $settings['file_temp_path'] = getenv('DRUPAL_FILE_TEMP_PATH') !== FALSE ? getenv('DRUPAL_FILE_TEMP_PATH') : '/tmp';
 
         // Reverse proxy.
-        if (intval(getenv('DRUPAL_REVERSE_PROXY_ENABLE')) === 1) {
-          $settings['reverse_proxy'] = (bool) getenv('DRUPAL_REVERSE_PROXY_ENABLE');
+        if (filter_var(getenv('DRUPAL_REVERSE_PROXY_ENABLE'), FILTER_VALIDATE_BOOLEAN)) {
+          $settings['reverse_proxy'] = getenv('DRUPAL_REVERSE_PROXY_ENABLE');
           $settings['reverse_proxy_addresses'] = explode(',', getenv('DRUPAL_REVERSE_PROXY_ADDRESSES'));
         }
 
@@ -167,8 +167,8 @@
         $settings['file_temp_path'] = getenv('DRUPAL_FILE_TEMP_PATH') !== FALSE ? getenv('DRUPAL_FILE_TEMP_PATH') : '/tmp';
 
         // Reverse proxy.
-        if (intval(getenv('DRUPAL_REVERSE_PROXY_ENABLE')) === 1) {
-          $settings['reverse_proxy'] = (bool) getenv('DRUPAL_REVERSE_PROXY_ENABLE');
+        if (filter_var(getenv('DRUPAL_REVERSE_PROXY_ENABLE'), FILTER_VALIDATE_BOOLEAN)) {
+          $settings['reverse_proxy'] = getenv('DRUPAL_REVERSE_PROXY_ENABLE');
           $settings['reverse_proxy_addresses'] = explode(',', getenv('DRUPAL_REVERSE_PROXY_ADDRESSES'));
         }