diff --git a/photologue_custom/management/commands/duplicate.py b/photologue_custom/management/commands/duplicate.py
index e3bd130..97a902a 100644
--- a/photologue_custom/management/commands/duplicate.py
+++ b/photologue_custom/management/commands/duplicate.py
@@ -54,7 +54,8 @@ def find_duplicate(gallery):
     duplicate = {}
 
     for photo in gallery.photos.all():
-        h0 = hashlib.sha256(photo.image.read()).digest()
+        with photo.image.open("rb") as f:
+            h0 = hashlib.sha256(f.read()).digest()
         if h0 not in non_duplicate:
             # Photo is not a duplicate
             non_duplicate[h0] = photo