diff --git a/windows/wingss.c b/windows/wingss.c
index 222b34fa..773e6609 100644
--- a/windows/wingss.c
+++ b/windows/wingss.c
@@ -1,8 +1,10 @@
 #ifndef NO_GSSAPI
 
-#include <windows.h>
+#include "putty.h"
+
 #define SECURITY_WIN32
 #include <security.h>
+
 #include "sshgss.h"
 #include "misc.h"