diff --git a/waf/baidu.py b/waf/baidu.py
index 27f1f21ca..81f928bd2 100644
--- a/waf/baidu.py
+++ b/waf/baidu.py
@@ -7,6 +7,7 @@ See the file 'doc/COPYING' for copying permission
 
 import re
 
+from lib.core.enums import HTTP_HEADER
 from lib.core.settings import WAF_ATTACK_VECTORS
 
 __product__ = "Yunjiasu Web Application Firewall (Baidu)"
@@ -17,7 +18,7 @@ def detect(get_page):
     for vector in WAF_ATTACK_VECTORS:
         page, headers, code = get_page(get=vector)
         retval = re.search(r"fhl", headers.get("X-Server", ""), re.I) is not None
-        retval |= re.search(r"yunjiasu-nginx", headers.get("server"), re.I) is not None
+        retval |= re.search(r"yunjiasu-nginx", headers.get(HTTP_HEADER.SERVER), re.I) is not None
         if retval:
             break