diff -r c7c2b677ac1b -r 288d59cf3e2e Lib/test/test_int_jy.py
--- a/Lib/test/test_int_jy.py	Sat Jun 21 22:51:38 2014 -0600
+++ b/Lib/test/test_int_jy.py	Mon Jun 23 08:37:05 2014 -0700
@@ -11,6 +11,12 @@
     def test_type_matches(self):
         self.assert_(isinstance(1, types.IntType))
 
+    def test_int_pow(self):
+        self.assertEquals(pow(10, 10, None), 10000000000L)
+        self.assertEquals(int.__pow__(10, 10, None), 10000000000L)
+        self.assertEquals((10).__pow__(10, None), 10000000000L)
+        self.assertEquals((10).__pow__(10L, None), 10000000000L)
+
 def test_main():
     test_support.run_unittest(IntTestCase)
 
diff -r c7c2b677ac1b -r 288d59cf3e2e Lib/test/test_long_jy.py
--- a/Lib/test/test_long_jy.py	Sat Jun 21 22:51:38 2014 -0600
+++ b/Lib/test/test_long_jy.py	Mon Jun 23 08:37:05 2014 -0700
@@ -26,6 +26,12 @@
         # http://bugs.jython.org/issue1828
         self.assertTrue(bool(MyLong(42)))
 
+    def test_long_pow(self):
+        self.assertEquals(pow(10L, 10L, None), 10000000000L)
+        self.assertEquals(long.__pow__(10L, 10L, None), 10000000000L)
+        self.assertEquals((10L).__pow__(10L, None), 10000000000L)
+        self.assertEquals((10L).__pow__(10, None), 10000000000L)
+
 
 def test_main():
     test_support.run_unittest(LongTestCase)
diff -r c7c2b677ac1b -r 288d59cf3e2e src/org/python/core/PyFloat.java
--- a/src/org/python/core/PyFloat.java	Sat Jun 21 22:51:38 2014 -0600
+++ b/src/org/python/core/PyFloat.java	Mon Jun 23 08:37:05 2014 -0700
@@ -714,7 +714,10 @@
     final PyObject float___pow__(PyObject right, PyObject modulo) {
         if (!canCoerce(right)) {
             return null;
-        } else if (modulo != null) {
+        }
+
+        modulo = (modulo == Py.None) ? null : modulo;
+        if (modulo != null) {
             throw Py.TypeError("pow() 3rd argument not allowed unless all arguments are integers");
         }
 
diff -r c7c2b677ac1b -r 288d59cf3e2e src/org/python/core/PyInteger.java
--- a/src/org/python/core/PyInteger.java	Sat Jun 21 22:51:38 2014 -0600
+++ b/src/org/python/core/PyInteger.java	Mon Jun 23 08:37:05 2014 -0700
@@ -574,6 +574,7 @@
             return null;
         }
 
+        modulo = (modulo == Py.None) ? null : modulo;
         if (modulo != null && !canCoerce(modulo)) {
             return null;
         }
@@ -581,21 +582,17 @@
         return _pow(getValue(), coerce(right), modulo, this, right);
     }
 
-    public PyObject __rpow__(PyObject left, PyObject modulo) {
+    @Override
+    public PyObject __rpow__(PyObject left) {
         if (!canCoerce(left)) {
             return null;
         }
-
-        if (modulo != null && !canCoerce(modulo)) {
-            return null;
-        }
-
-        return _pow(coerce(left), getValue(), modulo, left, this);
+        return _pow(coerce(left), getValue(), null, left, this);
     }
 
     @ExposedMethod(type = MethodType.BINARY, doc = BuiltinDocs.int___rpow___doc)
     final PyObject int___rpow__(PyObject left) {
-        return __rpow__(left, null);
+        return __rpow__(left);
     }
 
     private static PyObject _pow(int value, int pow, PyObject modulo,//
diff -r c7c2b677ac1b -r 288d59cf3e2e src/org/python/core/PyLong.java
--- a/src/org/python/core/PyLong.java	Sat Jun 21 22:51:38 2014 -0600
+++ b/src/org/python/core/PyLong.java	Mon Jun 23 08:37:05 2014 -0700
@@ -659,9 +659,11 @@
             return null;
         }
 
+        modulo = (modulo == Py.None) ? null : modulo;
         if (modulo != null && !canCoerce(right)) {
             return null;
         }
+
         return _pow(getValue(), coerce(right), modulo, this, right);
     }
 
@@ -675,6 +677,7 @@
         if (!canCoerce(left)) {
             return null;
         }
+
         return _pow(coerce(left), getValue(), null, left, this);
     }