diff --git a/device/accton/x86_64-accton_as9736_64d-r0/Accton-AS9736-64D/th4-as9736-64x400G.config.yml b/device/accton/x86_64-accton_as9736_64d-r0/Accton-AS9736-64D/th4-as9736-64x400G.config.yml
index fcf2245b0465..af288ab089eb 100644
--- a/device/accton/x86_64-accton_as9736_64d-r0/Accton-AS9736-64D/th4-as9736-64x400G.config.yml
+++ b/device/accton/x86_64-accton_as9736_64d-r0/Accton-AS9736-64D/th4-as9736-64x400G.config.yml
@@ -1193,7 +1193,7 @@ device:
                 NUM_LANES: 1
                 MAX_FRAME_SIZE: 9416
         SER_CONFIG:
-            SER_ENABLE: 0
+            SER_ENABLE: 1
         PORT_CONFIG:
             PORT_SYSTEM_PROFILE_OPERMODE_PIPEUNIQUE: 1
 device: