diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
index b3d258f32e..4303e187c4 100755
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/chassis.py
@@ -207,7 +207,7 @@ class Chassis(ChassisBase):
         Returns:
             string: Serial number of chassis
         """
-        return self._eeprom.serial_str()
+        return self._eeprom.serial_number_str()
 
     def get_status(self):
         """
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
index ab3bb174e6..500b2c0e4a 100644
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/eeprom.py
@@ -78,8 +78,14 @@ class Eeprom(eeprom_tlvinfo.TlvInfoDecoder):
                 self.eeprom_tlv_dict[mac_code] = '00:00:00:00:00:00'
 
     def serial_number_str(self):
-        (is_valid, results) = self.get_tlv_field(
-                    self.eeprom_data, self._TLV_CODE_SERIAL_NUMBER)
+        # For Chassis, return service tag instead of serial number
+        if not self.is_module:
+            (is_valid, results) = self.get_tlv_field(
+                        self.eeprom_data, self._TLV_CODE_SERVICE_TAG)
+        else:
+            (is_valid, results) = self.get_tlv_field(
+                        self.eeprom_data, self._TLV_CODE_SERIAL_NUMBER)
+
         if not is_valid:
             return "N/A"
 
@@ -113,14 +119,6 @@ class Eeprom(eeprom_tlvinfo.TlvInfoDecoder):
 
         return results[2].decode('ascii')
 
-    def serial_str(self):
-        (is_valid, results) = self.get_tlv_field(
-                    self.eeprom_data, self._TLV_CODE_SERVICE_TAG)
-        if not is_valid:
-            return "N/A"
-
-        return results[2].decode('ascii')
-
     def revision_str(self):
         (is_valid, results) = self.get_tlv_field(
                     self.eeprom_data, self._TLV_CODE_LABEL_REVISION)
diff --git a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
index 163a0ab398..751d90fcc6 100644
--- a/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
+++ b/platform/broadcom/sonic-platform-modules-dell/s6100/sonic_platform/module.py
@@ -139,7 +139,7 @@ class Module(ModuleBase):
         Returns:
             string: Serial number of module
         """
-        return self._eeprom.serial_str()
+        return self._eeprom.serial_number_str()
 
     def get_status(self):
         """