diff --git a/libraries/utils.robot b/libraries/utils.robot
index 892d457..2cfe4ea 100644
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -351,7 +351,7 @@
     #Run Keyword    Wait Until Keyword Succeeds    ${timeout}    5s    Validate OLT Flows    ${olt_flows}
     #${List_ONU_Serial}    Create List
     #Set Suite Variable    ${List_ONU_Serial}
-    #Build ONU SN List    ${List_ONU_Serial}
+    #Build ONU SN List    ${List_ONU_Serial}    ${olt_serial_number}
     #Log    ${List_ONU_Serial}
     #Run Keyword    Wait Until Keyword Succeeds    ${timeout}    5s    Validate ONU Flows
     #...    ${List_ONU_Serial}    ${onu_flows}
@@ -380,7 +380,7 @@
         ...    ${olt_device_id}
         ${List_ONU_Serial}    Create List
         Set Suite Variable    ${List_ONU_Serial}
-        Build ONU SN List    ${List_ONU_Serial}
+        Build ONU SN List    ${List_ONU_Serial}    ${olt_serial_number}
         Log    ${List_ONU_Serial}
         Run Keyword    Wait Until Keyword Succeeds    ${timeout}    5s    Validate ONU Flows
         ...    ${List_ONU_Serial}    ${onu_flows}