diff --git a/src/auto_archiver/modules/hash_enricher/hash_enricher.py b/src/auto_archiver/modules/hash_enricher/hash_enricher.py
index b3ca8be..7a0587c 100644
--- a/src/auto_archiver/modules/hash_enricher/hash_enricher.py
+++ b/src/auto_archiver/modules/hash_enricher/hash_enricher.py
@@ -30,10 +30,10 @@ class HashEnricher(Enricher):
                 to_enrich.media[i].set("hash", f"{self.algorithm}:{hd}")
 
     def calculate_hash(self, filename) -> str:
-        hash = None
+        hash_algo = None
         if self.algorithm == "SHA-256":
-            hash = hashlib.sha256()
+            hash_algo = hashlib.sha256
         elif self.algorithm == "SHA3-512":
-            hash = hashlib.sha3_512()
+            hash_algo = hashlib.sha3_512
         else: return ""
-        return calculate_file_hash(filename, hash, self.chunksize)
+        return calculate_file_hash(filename, hash_algo, self.chunksize)
diff --git a/src/auto_archiver/utils/misc.py b/src/auto_archiver/utils/misc.py
index 3af5a54..4d48372 100644
--- a/src/auto_archiver/utils/misc.py
+++ b/src/auto_archiver/utils/misc.py
@@ -65,10 +65,11 @@ def json_loader(cli_val):
     return json.loads(cli_val)
 
 
-def calculate_file_hash(filename: str, hash_algo = hashlib.sha256(), chunksize: int = 16000000) -> str:
+def calculate_file_hash(filename: str, hash_algo = hashlib.sha256, chunksize: int = 16000000) -> str:
+    hash = hash_algo()
     with open(filename, "rb") as f:
         while True:
             buf = f.read(chunksize)
             if not buf: break
-            hash_algo.update(buf)
-    return hash_algo.hexdigest()
+            hash.update(buf)
+    return hash.hexdigest()