diff --git a/src/classic.jl b/src/classic.jl
index 4d45d4c..3f07083 100644
--- a/src/classic.jl
+++ b/src/classic.jl
@@ -51,11 +51,14 @@ function write_finish(patch::ClassicPatch)
     for stream in (patch.ctrl, patch.diff, patch.data)
         write(stream, TranscodingStreams.TOKEN_END)
     end
-    write_int(patch.io, patch.ctrl.stream.size)
-    write_int(patch.io, patch.diff.stream.size)
+    ctrl_v = take!(patch.ctrl.stream)
+    diff_v = take!(patch.diff.stream)
+    data_v = take!(patch.data.stream)
+    write_int(patch.io, length(ctrl_v))
+    write_int(patch.io, length(diff_v))
     write_int(patch.io, patch.new_size)
-    for stream in (patch.ctrl, patch.diff, patch.data)
-        write(patch.io, resize!(stream.stream.data, stream.stream.size))
+    for v in (ctrl_v, diff_v, data_v)
+        write(patch.io, v)
     end
     flush(patch.io)
     finalize(patch)