diff --git a/dulwich/pack.py b/dulwich/pack.py
index b2e47fc37..fd72f7a1d 100644
--- a/dulwich/pack.py
+++ b/dulwich/pack.py
@@ -1859,7 +1859,7 @@ def get_raw(self, sha1):
     def __getitem__(self, sha1):
         """Retrieve the specified SHA1."""
         type, uncomp = self.get_raw(sha1)
-        return ShaFile.from_raw_string(type, uncomp)
+        return ShaFile.from_raw_string(type, uncomp, sha=sha1)
 
     def iterobjects(self):
         """Iterate over the objects in this pack."""