diff --git a/nifty5/minimization/metric_gaussian_kl.py b/nifty5/minimization/metric_gaussian_kl.py
index 203bc6e252e28c5136a0ee9e86528c994b1faed4..7d98678266d1c800ae11e0caa50580a572865073 100644
--- a/nifty5/minimization/metric_gaussian_kl.py
+++ b/nifty5/minimization/metric_gaussian_kl.py
@@ -130,4 +130,4 @@ class MetricGaussianKL(Energy):
 
     def __repr__(self):
         return 'KL ({} samples):\n'.format(len(
-            self._samples)) + utilities.indent(self._ham.__repr__())
+            self._samples)) + utilities.indent(self._hamiltonian.__repr__())