diff --git a/minihttptestserver.c b/minihttptestserver.c
index bbfdac3..a43999d 100644
--- a/minihttptestserver.c
+++ b/minihttptestserver.c
@@ -1,3 +1,6 @@
+#ifndef INADDR_LOOPBACK
+#define INADDR_LOOPBACK         0x7f000001
+#endif
 /* $Id: minihttptestserver.c,v 1.17 2015/02/06 10:31:19 nanard Exp $ */
  /* Project : miniUPnP
    * Author : Thomas Bernard