Index: jython-2.5.2/src/org/python/modules/_collections/PyDefaultDict.java
===================================================================
--- jython-2.5.2.orig/src/org/python/modules/_collections/PyDefaultDict.java	2013-10-16 22:54:45.000000000 +0200
+++ jython-2.5.2/src/org/python/modules/_collections/PyDefaultDict.java	2013-10-16 22:57:06.000000000 +0200
@@ -16,7 +16,7 @@
 import org.python.expose.ExposedSet;
 import org.python.expose.ExposedType;
 
-import com.google.common.collect.MapMaker;
+import com.google.common.cache.CacheBuilder;
 import com.google.common.collect.ComputationException;
 import com.google.common.base.Function;
 import org.python.core.BuiltinDocs;
@@ -53,10 +53,9 @@
     public PyDefaultDict(PyType subtype) {
         super(subtype, false);
         backingMap =
-                new MapMaker().makeComputingMap(
-                new Function<PyObject, PyObject>() {
-
-                    public PyObject apply(PyObject key) {
+                new CacheBuilder.build(
+                new CacheLoader<PyObject, PyObject>() {
+                    public PyObject load(PyObject key) {
                         if (defaultFactory == Py.None) {
                             throw Py.KeyError(key);
                         }