diff --git a/pw_stream/public/pw_stream/memory_stream.h b/pw_stream/public/pw_stream/memory_stream.h
index 84d9f5df2..1ccf9ab6a 100644
--- a/pw_stream/public/pw_stream/memory_stream.h
+++ b/pw_stream/public/pw_stream/memory_stream.h
@@ -35,6 +35,7 @@ class MemoryWriter : public Writer {
 
   ConstByteSpan WrittenData() const { return dest_.first(bytes_written_); }
 
+  std::byte* data() { return dest_.data(); }
   const std::byte* data() const { return dest_.data(); }
 
  private: