diff --git a/src/inet/IPEndPointBasis.cpp b/src/inet/IPEndPointBasis.cpp
index afb2626..e535613 100644
--- a/src/inet/IPEndPointBasis.cpp
+++ b/src/inet/IPEndPointBasis.cpp
@@ -24,6 +24,9 @@
  *
  */
 
+// define to ensure we have the IPV6_PKTINFO
+#define __APPLE_USE_RFC_3542
+
 #include <InetLayer/IPEndPointBasis.h>
 
 #include <string.h>