diff --git a/src/win/winsock.h b/src/win/winsock.h
index 433ce476..954ad5ce 100644
--- a/src/win/winsock.h
+++ b/src/win/winsock.h
@@ -45,6 +45,10 @@
   #define IPV6_V6ONLY 27
 #endif
 
+#ifndef IPV6_HOPLIMIT
+  #define IPV6_HOPLIMIT 21
+#endif
+
 /*
  * TDI defines that are only in the DDK.
  * We only need receive flags so far.