diff --git a/src/vnet/gre/gre.h b/src/vnet/gre/gre.h
index 7f6ff0b..70f6241 100644
--- a/src/vnet/gre/gre.h
+++ b/src/vnet/gre/gre.h
@@ -25,6 +25,7 @@
 #include <vnet/ip/format.h>
 #include <vnet/adj/adj_types.h>
 #include <vnet/tunnel/tunnel.h>
+#include <vnet/nhrp/nhrp.h>
 
 extern vnet_hw_interface_class_t gre_hw_interface_class;
 extern vnet_hw_interface_class_t mgre_hw_interface_class;
@@ -323,6 +324,15 @@
 extern void gre_update_adj (vnet_main_t * vnm,
 			    u32 sw_if_index, adj_index_t ai);
 
+typedef struct mgre_walk_ctx_t_
+{
+  const gre_tunnel_t *t;
+  const nhrp_entry_t *ne;
+} mgre_walk_ctx_t;
+
+adj_walk_rc_t mgre_mk_complete_walk (adj_index_t ai, void *data);
+adj_walk_rc_t mgre_mk_incomplete_walk (adj_index_t ai, void *data);
+
 format_function_t format_gre_protocol;
 format_function_t format_gre_header;
 format_function_t format_gre_header_with_length;