diff --git a/agent/src/core_utils.h b/agent/src/core_utils.h
index 5f64e47..5de6753 100644
--- a/agent/src/core_utils.h
+++ b/agent/src/core_utils.h
@@ -101,4 +101,5 @@
 Status check_bal_ready();
 Status check_connection();
 std::string get_ip_address(const char* nw_intf);
+bcmos_errno getOnuMaxLogicalDistance(uint32_t intf_id, uint32_t *mld);
 #endif // OPENOLT_CORE_UTILS_H_