diff --git a/lib/http_negotiate.c b/lib/http_negotiate.c
index f0cf16b9e..4e68ab762 100644
--- a/lib/http_negotiate.c
+++ b/lib/http_negotiate.c
@@ -37,6 +37,7 @@
 #include "curl_base64.h"
 #include "http_negotiate.h"
 #include "curl_memory.h"
+#include "url.h"
 
 #ifdef HAVE_SPNEGO
 #  include <spnegohelp.h>