diff --git a/src/wrapper/basics.cpp b/src/wrapper/basics.cpp
index b84f672..ba037dc 100644
--- a/src/wrapper/basics.cpp
+++ b/src/wrapper/basics.cpp
@@ -51,7 +51,7 @@ namespace
   {
       static PyObject *convert(ByteVector const& s)
         {
-          return PyUnicode_FromStringAndSize(s.data(), s.size());
+          return PyBytes_FromStringAndSize(s.data(), s.size());
         }
   };