diff --git a/src/objectifier.py b/src/objectifier.py
index 7108354..f63521b 100644
--- a/src/objectifier.py
+++ b/src/objectifier.py
@@ -116,10 +116,10 @@ def analyze_image(request: Request, image: UploadFile):
     base_url = re.sub(r'\/images\/?$', '/analyzed_images/', str(request.url))
     infile = incoming_dir / image.filename
     file_hash = hashlib.sha256()
-    file_hash.update(image)
     with open(infile, "w") as f:
         chunk = image.read(buffer_size)
         while chunk:
+            file_hash.update(chunk)
             print ("writing " + buffer_size + " bytes")
             f.write(chunk)
             chunk = image.read(buffer_size)