diff --git a/find_duplicate_files/find_duplicate_files.py b/find_duplicate_files/find_duplicate_files.py
index ecafbe0..d374c9b 100644
--- a/find_duplicate_files/find_duplicate_files.py
+++ b/find_duplicate_files/find_duplicate_files.py
@@ -11,7 +11,7 @@ import logging
 import click
 import click_config_file
 from logging.handlers import SysLogHandler
-import hashlib
+import zlib
 
 class find_duplicate_files:
 
@@ -45,11 +45,10 @@ class find_duplicate_files:
             for file in os.scandir(path):
                 if not file.name.startswith('.'):
                     if file.is_file():
-                        hash = hashlib.sha256()
                         with open(file.path, 'rb') as file_pointer:
                             file_content = file_pointer.read()
-                            hash.update(file_content)
-                            files[hash.hexdigest()] = file.path
+                            hash = zlib.adler32(file_content)
+                            files[hash] = file.path
                     elif file.is_dir(follow_symlinks=False):
                         more_files = self.recursive_scandir(
                             file.path,