diff --git a/GPy/plotting/matplot_dep/priors_plots.py b/GPy/plotting/matplot_dep/priors_plots.py
index 51d84f86d..c537f5e5c 100644
--- a/GPy/plotting/matplot_dep/priors_plots.py
+++ b/GPy/plotting/matplot_dep/priors_plots.py
@@ -11,7 +11,7 @@
 
 def univariate_plot(prior):
     rvs = prior.rvs(1000)
-    pb.hist(rvs, 100, normed=True)
+    pb.hist(rvs, 100, density=True)
     xmin, xmax = pb.xlim()
     xx = np.linspace(xmin, xmax, 1000)
     pb.plot(xx, prior.pdf(xx), 'r', linewidth=2)