diff --git a/CHANGELOG.md b/CHANGELOG.md
index dd06e2f9..0802caee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Changelog
 
+* replace PHP `getenv` calls with `$_SERVER` lookups
 * adds `view.fallbackMode` option to generally serve only fallback mode
 * serves fallback mode for text browsers (`curl`, `links`, `lynx`, `w3m`)
 * change type `txt-svg` to `img-svg`, no thumbs but preview
diff --git a/src/_h5ai/private/php/core/class-setup.php b/src/_h5ai/private/php/core/class-setup.php
index 8b836db8..3e24a558 100644
--- a/src/_h5ai/private/php/core/class-setup.php
+++ b/src/_h5ai/private/php/core/class-setup.php
@@ -49,11 +49,11 @@ class Setup {
         $this->set('PHP_VERSION', PHP_VERSION);
         $this->set('MIN_PHP_VERSION', MIN_PHP_VERSION);
 
-        $this->set('REQUEST_METHOD', getenv('REQUEST_METHOD'));
-        $this->set('REQUEST_HREF', parse_url(getenv('REQUEST_URI'), PHP_URL_PATH));
-        $this->set('SCRIPT_NAME', getenv('SCRIPT_NAME'));
-        $this->set('SERVER_SOFTWARE', getenv('SERVER_SOFTWARE'));
-        $this->set('HTTP_USER_AGENT', getenv('HTTP_USER_AGENT'));
+        $this->set('REQUEST_METHOD', $_SERVER['REQUEST_METHOD']);
+        $this->set('REQUEST_HREF', parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH));
+        $this->set('SCRIPT_NAME', $_SERVER['SCRIPT_NAME']);
+        $this->set('SERVER_SOFTWARE', $_SERVER['SERVER_SOFTWARE']);
+        $this->set('HTTP_USER_AGENT', $_SERVER['HTTP_USER_AGENT']);
     }
 
     private function add_php_checks() {