diff --git a/python/pyspark/mllib/tests.py b/python/pyspark/mllib/tests.py
index 1487470f56d43..9536404230bd2 100644
--- a/python/pyspark/mllib/tests.py
+++ b/python/pyspark/mllib/tests.py
@@ -310,7 +310,7 @@ def test_classification(self):
 
         rf_model = RandomForest.trainClassifier(
             rdd, numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo, numTrees=10,
-            maxBins=4)
+            maxBins=4, seed=1)
         self.assertTrue(rf_model.predict(features[0]) <= 0)
         self.assertTrue(rf_model.predict(features[1]) > 0)
         self.assertTrue(rf_model.predict(features[2]) <= 0)