diff --git a/sys/dev/netmap/netmap_kern.h b/sys/dev/netmap/netmap_kern.h
index 401195e3b72d..087564cc6974 100644
--- a/sys/dev/netmap/netmap_kern.h
+++ b/sys/dev/netmap/netmap_kern.h
@@ -62,6 +62,9 @@
 #define NM_ATOMIC_TEST_AND_SET(p)       (!atomic_cmpset_acq_int((p), 0, 1))
 #define NM_ATOMIC_CLEAR(p)              atomic_store_rel_int((p), 0)
 
+#if __FreeBSD_version >= 1100005
+struct netmap_adapter *netmap_getna(if_t ifp);
+#endif
 
 MALLOC_DECLARE(M_NETMAP);
 
@@ -1261,7 +1264,6 @@ void netmap_catch_tx(struct netmap_generic_adapter *na, int enable);
 int generic_xmit_frame(struct ifnet *ifp, struct mbuf *m, void *addr, u_int len, u_int ring_nr);
 int generic_find_num_desc(struct ifnet *ifp, u_int *tx, u_int *rx);
 void generic_find_num_queues(struct ifnet *ifp, u_int *txq, u_int *rxq);
-struct netmap_adapter *netmap_getna(if_t ifp);
 
 /*
  * netmap_mitigation API. This is used by the generic adapter