diff --git a/wstools/WSDLTools.py b/wstools/WSDLTools.py
index 61136c5..c341178 100644
--- a/wstools/WSDLTools.py
+++ b/wstools/WSDLTools.py
@@ -10,7 +10,11 @@
 ident = "$Id$"
 
 import weakref
-from cStringIO import StringIO
+try:
+    from io import StringIO
+except ImportError:
+    from cStringIO import StringIO
+
 from Namespaces import OASIS, XMLNS, WSA, WSA_LIST, WSAW_LIST, WSRF_V1_2, WSRF
 from Utility import Collection, CollectionNS, DOM, ElementProxy, basejoin
 from XMLSchema import XMLSchema, SchemaReader, WSDLToolsAdapter
diff --git a/wstools/c14n.py b/wstools/c14n.py
index f88160d..462fc4c 100644
--- a/wstools/c14n.py
+++ b/wstools/c14n.py
@@ -56,7 +56,10 @@ except:
         BASE = "http://www.w3.org/2000/xmlns/"
         XML = "http://www.w3.org/XML/1998/namespace"
 
-import io
+try:
+    from io import StringIO
+except ImportError:
+    from cStringIO import StringIO
 
 _attrs = lambda E: (E.attributes and list(E.attributes.values())) or []
 _children = lambda E: E.childNodes or []