diff --git a/gramps/plugins/docgen/odfdoc.py b/gramps/plugins/docgen/odfdoc.py
index d86a8660d..30e073b7f 100644
--- a/gramps/plugins/docgen/odfdoc.py
+++ b/gramps/plugins/docgen/odfdoc.py
@@ -73,7 +73,7 @@ import time
 import locale
 import sys
 if sys.version_info[0] < 3:
-    from StringIO import StringIO
+    from cStringIO import StringIO
 else:
     from io import StringIO
 from math import pi, cos, sin, degrees, radians