diff --git a/tests/PHPCurlClass/server.php b/tests/PHPCurlClass/server.php
index 14c9bdb..c90c2f9 100644
--- a/tests/PHPCurlClass/server.php
+++ b/tests/PHPCurlClass/server.php
@@ -1,6 +1,9 @@
 <?php
 // Prevent direct access unless testing.
-getenv('PHP_CURL_CLASS_TEST_MODE_ENABLED') === 'yes' || exit;
+if (getenv('PHP_CURL_CLASS_TEST_MODE_ENABLED') !== 'yes' &&
+    $_SERVER['PHP_CURL_CLASS_TEST_MODE_ENABLED'] !== 'yes') {
+    exit;
+}
 
 require_once 'ContentRangeServer.php';
 require_once 'RangeHeader.php';
diff --git a/tests/before_script.sh b/tests/before_script.sh
index a0a78d5..6996c59 100755
--- a/tests/before_script.sh
+++ b/tests/before_script.sh
@@ -67,6 +67,7 @@ server {
         fastcgi_index index.php;
         include fastcgi_params;
         fastcgi_param SCRIPT_FILENAME \$document_root\$fastcgi_script_name;
+        fastcgi_param "PHP_CURL_CLASS_TEST_MODE_ENABLED" "yes";
     }
 }
 EOF