diff --git a/demo/binary_classification/mushroom.conf b/demo/binary_classification/mushroom.conf
index dbc832244..d364905f7 100644
--- a/demo/binary_classification/mushroom.conf
+++ b/demo/binary_classification/mushroom.conf
@@ -1,6 +1,6 @@
 # General Parameters, see comment for each definition
-# choose the tree booster, 0: tree, 1: linear
-booster_type = 0 
+# choose the booster, can be gbtree or gblinear
+booster = gbtree
 # choose logistic regression loss function for binary classification
 objective = binary:logistic