diff --git a/amodem/common.py b/amodem/common.py
index 2fda33c..54e37a7 100644
--- a/amodem/common.py
+++ b/amodem/common.py
@@ -80,4 +80,6 @@ class AttributeHolder(object):
         self.__dict__.update(d)
 
     def __repr__(self):
-        return '{}({})'.format(self.__class__.__name__, self.__dict__)
+        items = sorted(self.__dict__.items())
+        args = ', '.join('{0}={1}'.format(k, v) for k, v in items)
+        return '{}({})'.format(self.__class__.__name__, args)
diff --git a/tests/test_common.py b/tests/test_common.py
index 499600e..7a9bd9d 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -51,3 +51,11 @@ def test_izip():
     x = range(10)
     y = range(-10, 0)
     assert list(common.izip([x, y])) == list(zip(x, y))
+
+
+def test_holder():
+    d = {'x': 1, 'y': 2.3}
+    a = common.AttributeHolder(d)
+    assert a.x == d['x']
+    assert a.y == d['y']
+    assert repr(a) == 'AttributeHolder(x=1, y=2.3)'