diff --git a/lib/http_ntlm.h b/lib/http_ntlm.h
index d186bbe37..babf8e003 100644
--- a/lib/http_ntlm.h
+++ b/lib/http_ntlm.h
@@ -1,5 +1,5 @@
-#ifndef HEADER_CURL_NTLM_H
-#define HEADER_CURL_NTLM_H
+#ifndef HEADER_CURL_HTTP_NTLM_H
+#define HEADER_CURL_HTTP_NTLM_H
 /***************************************************************************
  *                                  _   _ ____  _
  *  Project                     ___| | | |  _ \| |
@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -37,4 +37,4 @@ void Curl_http_ntlm_cleanup(struct connectdata *conn);
 
 #endif /* !CURL_DISABLE_HTTP && USE_NTLM */
 
-#endif /* HEADER_CURL_NTLM_H */
+#endif /* HEADER_CURL_HTTP_NTLM_H */