diff --git a/nipype/algorithms/metrics.py b/nipype/algorithms/metrics.py
index fc209a9d27..b58e7fc59b 100644
--- a/nipype/algorithms/metrics.py
+++ b/nipype/algorithms/metrics.py
@@ -150,7 +150,7 @@ def _eucl_mean(self, nii1, nii2, weighted=False):
         import matplotlib.pyplot as plt
 
         plt.figure()
-        plt.hist(min_dist_matrix, 50, normed=1, facecolor="green")
+        plt.hist(min_dist_matrix, 50, density=True, facecolor="green")
         plt.savefig(self._hist_filename)
         plt.clf()
         plt.close()