diff --git a/zk/base.py b/zk/base.py
index 660c316..86bdc22 100644
--- a/zk/base.py
+++ b/zk/base.py
@@ -1612,7 +1612,10 @@ def get_attendance(self):
 
                 attendance = Attendance(user_id, timestamp, status, punch, uid)
                 attendances.append(attendance)
-                attendance_data = attendance_data[40:]
+                if record_size == 49:
+                    attendance_data = attendance_data[49:]
+                else:
+                    attendance_data = attendance_data[40:]
         return attendances
 
     def clear_attendance(self):