diff --git a/tools/ext4slower.py b/tools/ext4slower.py
index 16b56ec..0524f22 100755
--- a/tools/ext4slower.py
+++ b/tools/ext4slower.py
@@ -29,7 +29,6 @@
 from bcc import BPF
 import argparse
 from time import strftime
-import ctypes as ct
 
 # symbols
 kallsyms = "/proc/kallsyms"
@@ -285,24 +284,9 @@
     if args.ebpf:
         exit()
 
-# kernel->user event data: struct data_t
-DNAME_INLINE_LEN = 32   # linux/dcache.h
-TASK_COMM_LEN = 16      # linux/sched.h
-class Data(ct.Structure):
-    _fields_ = [
-        ("ts_us", ct.c_ulonglong),
-        ("type", ct.c_ulonglong),
-        ("size", ct.c_ulonglong),
-        ("offset", ct.c_ulonglong),
-        ("delta_us", ct.c_ulonglong),
-        ("pid", ct.c_ulonglong),
-        ("task", ct.c_char * TASK_COMM_LEN),
-        ("file", ct.c_char * DNAME_INLINE_LEN)
-    ]
-
 # process event
 def print_event(cpu, data, size):
-    event = ct.cast(data, ct.POINTER(Data)).contents
+    event = b["events"].event(data)
 
     type = 'R'
     if event.type == 1: