diff --git a/device/celestica/x86_64-cel_silverstone-r0/plugins/psuutil.py b/device/celestica/x86_64-cel_silverstone-r0/plugins/psuutil.py
index 4ec920d462b7..46684aae0f22 100644
--- a/device/celestica/x86_64-cel_silverstone-r0/plugins/psuutil.py
+++ b/device/celestica/x86_64-cel_silverstone-r0/plugins/psuutil.py
@@ -12,7 +12,7 @@ class PsuUtil(PsuBase):
     """Platform-specific PSUutil class"""
 
     def __init__(self):
-        self.ipmi_raw = ["docker", "exec", "-ti", "pmon", "ipmitool", "raw", "0x4", "0x2d"]
+        self.ipmi_raw = ["docker", "exec", "-ti", "pmon", "ipmitool", "raw", "0x4", "0x2d", ""]
         self.psu1_id = "0x2f"
         self.psu2_id = "0x39"
         PsuBase.__init__(self)
@@ -51,7 +51,8 @@ def get_psu_status(self, index):
             return False
 
         psu_id = self.psu1_id if index == 1 else self.psu2_id
-        res_string = self.run_command(self.ipmi_raw.append(psu_id))
+        self.ipmi_raw[8] = psu_id
+        res_string = self.run_command(self.ipmi_raw)
         status_byte = self.find_value(res_string)
 
         if status_byte is None:
@@ -75,7 +76,8 @@ def get_psu_presence(self, index):
             return False
 
         psu_id = self.psu1_id if index == 1 else self.psu2_id
-        res_string = self.run_command(self.ipmi_raw.append(psu_id))
+        self.ipmi_raw[8] = psu_id
+        res_string = self.run_command(self.ipmi_raw)
         status_byte = self.find_value(res_string)
 
         if status_byte is None: