diff --git a/catalyst/examples/portfolio_optimization.py b/catalyst/examples/portfolio_optimization.py
index 26c957b6..c6da1f1f 100644
--- a/catalyst/examples/portfolio_optimization.py
+++ b/catalyst/examples/portfolio_optimization.py
@@ -66,7 +66,7 @@ def handle_data(context, data):
         # Define portfolio optimization parameters
         n_portfolios = 50000
         results_array = np.zeros((3 + context.nassets, n_portfolios))
-        for p in xrange(n_portfolios):
+        for p in range(n_portfolios):
             weights = np.random.random(context.nassets)
             weights /= np.sum(weights)
             w = np.asmatrix(weights)