diff --git a/src/python/histogram.cpp b/src/python/histogram.cpp
index 7a0d8004..e3ec4973 100644
--- a/src/python/histogram.cpp
+++ b/src/python/histogram.cpp
@@ -36,10 +36,10 @@ struct axis_visitor : public static_visitor<python::object>
 };
 
 python::object
-histogram_axis(const dynamic_histogram<>& self, unsigned i)
+histogram_axis(const dynamic_histogram<>& self, int i)
 {
   if (i < 0) i += self.dim();
-  if (i < 0 || i >= self.dim()) {
+  if (i < 0 || i >= int(self.dim())) {
     PyErr_SetString(PyExc_IndexError, "axis index out of range");
     python::throw_error_already_set();
   }
diff --git a/test/python_suite_test.py.in b/test/python_suite_test.py.in
index 924399f9..1ef36e22 100755
--- a/test/python_suite_test.py.in
+++ b/test/python_suite_test.py.in
@@ -489,6 +489,19 @@ class histogramtest(unittest.TestCase):
                     self.assertEqual(h.value(i, j), 2 * m[i][j])
                     self.assertEqual(h.variance(i, j), 2 * m[i][j])
 
+    def test_repr(self):
+        h = histogram(regular_axis(10, 0, 1), integer_axis(0, 1))
+        h2 = eval(repr(h))
+        self.assertEqual(h, h2)
+
+    def test_loop_axis(self):
+        axes = (regular_axis(10, 0, 1), integer_axis(0, 1))
+        h = histogram(*axes)
+        for a1, a2 in zip(h, axes):
+            self.assertEqual(a1, a2)
+        with self.assertRaises(IndexError):
+            h[3]
+
     def test_axis_overflow(self):
         h = histogram(*[regular_axis(1, 0, 1) for i in range(50)])
         with self.assertRaises(RuntimeError):