diff --git a/src/include/lwip/snmp.h b/src/include/lwip/snmp.h
index acdcbd93..a42a89a8 100644
--- a/src/include/lwip/snmp.h
+++ b/src/include/lwip/snmp.h
@@ -39,18 +39,18 @@
 #if defined(LWIP_SNMP) && (LWIP_SNMP > 0)
 
 /** fixed maximum length for object identifier type */
-#define OBJ_ID_LEN 32
+#define LWIP_SNMP_OBJ_ID_LEN 32
 /** internal object identifier representation */
-struct obj_id
+struct snmp_obj_id
 {
   u8_t len;
-  s32_t id[OBJ_ID_LEN];
+  s32_t id[LWIP_SNMP_OBJ_ID_LEN];
 };
 
 /* system */
 void snmp_inc_sysuptime(void);
 void snmp_get_sysuptime(u32_t *value);
-void snmp_get_sysobjid(const struct obj_id **oid);
+void snmp_get_sysobjid(const struct snmp_obj_id **oid);
 
 /* network interface */
 void snmp_add_ifinoctets(u32_t value); 
@@ -146,7 +146,7 @@ void snmp_inc_snmpoutgetnexts(void);
 void snmp_inc_snmpoutsetrequests(void);
 void snmp_inc_snmpoutgetresponses(void);
 void snmp_inc_snmpouttraps(void);
-void snmp_get_snmpgrpid(const struct obj_id **oid);
+void snmp_get_snmpgrpid(const struct snmp_obj_id **oid);
 
 /* LWIP_SNMP support not available */
 /* define everything to be empty */