diff --git a/object-file.c b/object-file.c
index 065103be3ea923..737a4902d5f183 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1889,7 +1889,7 @@ static void write_object_file_prepare(const struct git_hash_algo *algo,
 }
 
 static void write_object_file_prepare_literally(const struct git_hash_algo *algo,
-				      const void *buf, unsigned long len,
+				      const void *buf, size_t len,
 				      const char *type, struct object_id *oid,
 				      char *hdr, int *hdrlen)
 {
@@ -2357,7 +2357,7 @@ int write_object_file_flags(const void *buf, unsigned long len,
 	return 0;
 }
 
-int write_object_file_literally(const void *buf, unsigned long len,
+int write_object_file_literally(const void *buf, size_t len,
 				const char *type, struct object_id *oid,
 				unsigned flags)
 {
diff --git a/object-store-ll.h b/object-store-ll.h
index c5f2bb2fc2fe6e..e1d61d15ffccda 100644
--- a/object-store-ll.h
+++ b/object-store-ll.h
@@ -262,7 +262,7 @@ static inline int write_object_file(const void *buf, unsigned long len,
 	return write_object_file_flags(buf, len, type, oid, NULL, 0);
 }
 
-int write_object_file_literally(const void *buf, unsigned long len,
+int write_object_file_literally(const void *buf, size_t len,
 				const char *type, struct object_id *oid,
 				unsigned flags);
 int stream_loose_object(struct input_stream *in_stream, size_t len,