diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
index 981449ca8f18a7fd6aa2101ff3e88a04ca64b9ca..c9bb7a73f8fdcff9d8ecf6f7e47683e3ec0bdff7 100644
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -711,7 +711,7 @@ do_get_write_access(handle_t *handle, struct journal_head *jh,
 		J_EXPECT_JH(jh, buffer_uptodate(jh2bh(jh)),
 			    "Possible IO failure.\n");
 		page = jh2bh(jh)->b_page;
-		offset = ((unsigned long) jh2bh(jh)->b_data) & ~PAGE_MASK;
+		offset = offset_in_page(jh2bh(jh)->b_data);
 		source = kmap_atomic(page, KM_USER0);
 		memcpy(jh->b_frozen_data, source+offset, jh2bh(jh)->b_size);
 		kunmap_atomic(source, KM_USER0);