diff --git a/tests/server/sws.c b/tests/server/sws.c
index 269d0806c..b9a57aac3 100644
--- a/tests/server/sws.c
+++ b/tests/server/sws.c
@@ -83,6 +83,10 @@
 #define ECONNREFUSED WSAECONNREFUSED
 
 static void win32_cleanup(void);
+
+#if defined(ENABLE_IPV6) && defined(__MINGW32__)
+const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
+#endif
 #endif
 
 /* include memdebug.h last */