diff --git a/src/include/lwip/snmp_structs.h b/src/include/lwip/snmp_structs.h
index 9caf2471..e4e74131 100644
--- a/src/include/lwip/snmp_structs.h
+++ b/src/include/lwip/snmp_structs.h
@@ -39,6 +39,7 @@
 
 #include "lwip/opt.h"
 #include "arch/cc.h"
+#include "lwip/snmp.h"
 
 #if SNMP_PRIVATE_MIB
 #include "private_mib.h"
@@ -184,6 +185,8 @@ void noleafs_get_object_def(u8_t ident_len, s32_t *ident, struct obj_def *od);
 void noleafs_get_value(struct obj_def *od, u16_t len, void *value);
 
 struct mib_node* snmp_search_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct obj_def *object_def);
+struct mib_node* snmp_expand_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);
 u8_t snmp_iso_prefix_tst(u8_t ident_len, s32_t *ident);
+u8_t snmp_iso_prefix_expand(u8_t ident_len, s32_t *ident, struct snmp_obj_id *oidret);
 
 #endif