diff --git a/storage_server.py b/storage_server.py
index b047656..63c0ca0 100644
--- a/storage_server.py
+++ b/storage_server.py
@@ -303,7 +303,7 @@ class StorageHTTPServerHandler(BaseHTTPServer.BaseHTTPRequestHandler):
             
             ret = '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body>'
             
-            if "DOCTYPE" in post.upper():
+            if "<!DOCTYPE" in post.upper():
                 logger.log(logging.ERROR, "User tried to redefine a DOCTYPE")
                 return