diff --git a/php_fpm/datadog_checks/php_fpm/vendor/fcgi_app.py b/php_fpm/datadog_checks/php_fpm/vendor/fcgi_app.py
index 6fa138c4b71f2..bab638bff4d8d 100644
--- a/php_fpm/datadog_checks/php_fpm/vendor/fcgi_app.py
+++ b/php_fpm/datadog_checks/php_fpm/vendor/fcgi_app.py
@@ -28,6 +28,7 @@
 __version__ = '$Revision$'
 
 import select
+import sys
 import struct
 import socket
 import errno