diff --git a/gramps/plugins/export/exportpkg.py b/gramps/plugins/export/exportpkg.py
index 15531e528..5168a9945 100644
--- a/gramps/plugins/export/exportpkg.py
+++ b/gramps/plugins/export/exportpkg.py
@@ -39,7 +39,7 @@ import tarfile
 if sys.version_info[0] < 3:
     from cStringIO import StringIO
 else:
-    from io import StringIO
+    from io import StringIO, BytesIO
 from gramps.gen.const import GRAMPS_LOCALE as glocale
 _ = glocale.translation.gettext
 
@@ -218,7 +218,7 @@ class PackageWriter(object):
         if sys.version_info[0] < 3:
             g = StringIO()
         else:
-            g = io.BytesIO()
+            g = BytesIO()
         gfile = XmlWriter(self.db, self.user, 2)
         gfile.write_handle(g)
         tarinfo = tarfile.TarInfo('data.gramps')