diff --git a/sys/dev/netmap/netmap_freebsd.c b/sys/dev/netmap/netmap_freebsd.c
--- a/sys/dev/netmap/netmap_freebsd.c
+++ b/sys/dev/netmap/netmap_freebsd.c
@@ -738,6 +738,7 @@
 
 out_rem:
 	vm_map_remove(kernel_map, e->kva, e->kva + e->size);
+	e->obj = NULL; /* reference consumed by vm_map_remove() */
 out_rel:
 	vm_object_deallocate(e->obj);
 	e->obj = NULL;