diff --git a/library/system/user b/library/system/user
index 1fa114f8a87..de153c3f40d 100644
--- a/library/system/user
+++ b/library/system/user
@@ -395,7 +395,7 @@ class User(object):
         groups = []
         info = self.get_pwd_info()
         for group in grp.getgrall():
-            if self.name in group[3] and info[3] != group[2]:
+            if self.name in group.gr_mem and info[3] == group.gr_gid:
                 groups.append(group[0])
         return groups