diff --git a/sys/include/net/gnrc/ipv6/netif.h b/sys/include/net/gnrc/ipv6/netif.h
index fd6eb8c3983f5..d1b756f888fd0 100644
--- a/sys/include/net/gnrc/ipv6/netif.h
+++ b/sys/include/net/gnrc/ipv6/netif.h
@@ -183,6 +183,18 @@ extern "C" {
  */
 #define GNRC_IPV6_NETIF_FLAGS_IS_WIRED          (0x2000)
 
+/**
+ * @brief   Offset of the router advertisement flags compared to the position in router
+ *          advertisements.
+ */
+#define GNRC_IPV6_NETIF_FLAGS_RTR_ADV_POS       (8U)
+
+/**
+ * @brief   Mask for flags intended for router advertisements.
+ * @note    Please expand if more router advertisement flags are introduced.
+ */
+#define GNRC_IPV6_NETIF_FLAGS_RTR_ADV_MASK      (0xc000)
+
 /**
  * @brief   Flag to indicate that the interface has other address
  *          configuration.
diff --git a/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c b/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
index f31cb7c2c403f..145d2e021071a 100644
--- a/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
+++ b/sys/net/gnrc/network_layer/ndp/gnrc_ndp.c
@@ -322,8 +322,9 @@ void gnrc_ndp_rtr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt, ipv6_hdr_t
         if_entry->cur_hl = rtr_adv->cur_hl;
     }
     /* set flags from message */
-    if_entry->flags &= 0x3f;
-    if_entry->flags |= (rtr_adv->flags & (0xc0));
+    if_entry->flags &= ~GNRC_IPV6_NETIF_FLAGS_RTR_ADV_MASK;
+    if_entry->flags |= ((rtr_adv->flags << GNRC_IPV6_NETIF_FLAGS_RTR_ADV_POS) &
+                        (GNRC_IPV6_NETIF_FLAGS_RTR_ADV_MASK));
     /* set reachable time from message if it is not the same as the random base
      * value */
     if ((rtr_adv->reach_time.u32 != 0) &&