diff --git a/src/python/dm/common/utility/ldapLinuxPlatformUtility.py b/src/python/dm/common/utility/ldapLinuxPlatformUtility.py
index df6e458f7b4ffd7542ebe8b6839bb191a22e1985..b8ea8065289963c0807eb1525b4356c0b8c35b8a 100755
--- a/src/python/dm/common/utility/ldapLinuxPlatformUtility.py
+++ b/src/python/dm/common/utility/ldapLinuxPlatformUtility.py
@@ -213,15 +213,13 @@ class LdapLinuxPlatformUtility:
         cmd = '%s %s' % (cls.GROUPADD_CMD, name)
         cls.executeSudoCommand(cmd)
 
-    @classmethod
-    def addLocalUserToGroup(cls, username, groupName):
+    def addLocalUserToGroup(self, username, groupName):
         """ Add local user to group. """
-        cls.addUserToGroup(username, groupName)
+        self.addUserToGroup(username, groupName)
 
-    @classmethod
-    def deleteLocalUserFromGroup(cls, username, groupName):
+    def deleteLocalUserFromGroup(self, username, groupName):
         """ Remove local user from group. """
-        cls.deleteUserFromGroup(username, groupName)
+        self.deleteUserFromGroup(username, groupName)
 
     def getGroupInfo(self, groupName):
         """ Get given group info. """