diff --git a/sys/include/net/gnrc/netif/flags.h b/sys/include/net/gnrc/netif/flags.h
index 810177841c..d269fdda70 100644
--- a/sys/include/net/gnrc/netif/flags.h
+++ b/sys/include/net/gnrc/netif/flags.h
@@ -125,6 +125,16 @@ enum {
  */
 #define GNRC_NETIF_FLAGS_6LN                       (0x00001000U)
 
+/**
+ * @brief   6Lo is activated for this interface
+ *
+ * @note    Most devices supporting 6Lo actually *require* 6Lo so this flag
+ *          should not be configurable for them. As a consequence, this flag
+ *          **must** only be changed by a @ref NETOPT_6LO message to the
+ *          interface.
+ */
+#define GNRC_NETIF_FLAGS_6LO                       (0x00002000U)
+
 /**
  * @brief   Network interface is configured in raw mode
  */