diff --git a/sklearn/ensemble/tests/test_gradient_boosting.py b/sklearn/ensemble/tests/test_gradient_boosting.py
index 3ae437add6720ce8f379992623f5e99c4a1d532e..9f49024813878a56cc95c1cf67c720a2f82d04a9 100644
--- a/sklearn/ensemble/tests/test_gradient_boosting.py
+++ b/sklearn/ensemble/tests/test_gradient_boosting.py
@@ -214,7 +214,7 @@ def test_probability():
     assert np.all(y_proba <= 1.0)
 
     # derive predictions from probabilities
-    y_pred = clf.classes.take(y_proba.argmax(axis=1), axis=0)
+    y_pred = clf.classes_.take(y_proba.argmax(axis=1), axis=0)
     assert_array_equal(y_pred, true_result)