diff --git a/find_duplicate_files/find_duplicate_files.py b/find_duplicate_files/find_duplicate_files.py
index 3020a12..e6c4380 100644
--- a/find_duplicate_files/find_duplicate_files.py
+++ b/find_duplicate_files/find_duplicate_files.py
@@ -46,8 +46,8 @@ class find_duplicate_files:
                 if not file.name.startswith('.'):
                     if file.is_file():
                         hash = hashlib.sha256()
-                        with open(file.path, 'r') as file_pointer:
-                            digest = hashlib.file_digest(f, "sha256")
+                        with open(file.path, 'rb') as file_pointer:
+                            digest = hashlib.file_digest(file_pointer, "sha256")
                             files[digest.hexdigest()] = file.path
                     elif file.is_dir(follow_symlinks=False):
                         more_files = self.recursive_scandir(