diff -up iotop-0.6/iotop/data.py.delayacctcheck iotop-0.6/iotop/data.py
--- iotop-0.6/iotop/data.py.delayacctcheck	2023-12-11 22:15:47.280664665 +0100
+++ iotop-0.6/iotop/data.py	2023-12-11 22:14:16.689868890 +0100
@@ -27,6 +27,7 @@ import stat
 import struct
 import sys
 import time
+from procfs import cmdline
 
 #
 # Check for requirements:
@@ -455,8 +456,17 @@ class ProcessList(DumpableObject):
 
 
 def sysctl_task_delayacct():
+    """ WAS:
     try:
         with open('/proc/sys/kernel/task_delayacct') as f:
             return bool(int(f.read().strip()))
     except FileNotFoundError:
         return None
+
+
+    Because /proc/sys/kernel/task_delayacct doesn't exist on RHEL8,
+    it always returns None, which is equivalent to False in the end.
+
+    On RHEL8, delayacct_on kernel variable is enabled by default
+    """
+    return 'nodelayacct' not in cmdline().keys()