diff --git a/packages/modules/common/sdm.py b/packages/modules/common/sdm.py
index 84a00e3159..2e348bfdd1 100644
--- a/packages/modules/common/sdm.py
+++ b/packages/modules/common/sdm.py
@@ -57,7 +57,7 @@ def get_counter_state(self) -> CounterState:
             powers=resp[SdmRegister.POWER_L1],
             power_factors=resp[SdmRegister.POWER_FACTOR_L1],
             frequency=frequency,
-            serial_number=self.get_serial_number()
+            serial_number=self.serial_number
         )
         check_meter_values(counter_state, self.fault_state)
         return counter_state
@@ -93,7 +93,7 @@ def get_counter_state(self) -> CounterState:
             powers=[resp[SdmRegister.POWER_L1], 0, 0],
             power_factors=[resp[SdmRegister.POWER_FACTOR_L1], 0, 0],
             frequency=frequency,
-            serial_number=self.get_serial_number()
+            serial_number=self.serial_number
         )
         check_meter_values(counter_state, self.fault_state)
         return counter_state