diff --git a/python/pyspark/sql/tests.py b/python/pyspark/sql/tests.py
index 10b99175ad952729f2abb9fc34baebd0dd232d86..9ada96601a1cd283696ae6a22da14f603b66ca6b 100644
--- a/python/pyspark/sql/tests.py
+++ b/python/pyspark/sql/tests.py
@@ -360,7 +360,7 @@ class SQLTests(ReusedPySparkTestCase):
         df2 = self.sqlCtx.createDataFrame(rdd, samplingRatio=1.0)
         self.assertEqual(df.schema, df2.schema)
 
-        rdd = self.sc.parallelize(range(10)).map(lambda x: Row(a=x))
+        rdd = self.sc.parallelize(range(10)).map(lambda x: Row(a=x, b=None))
         df3 = self.sqlCtx.createDataFrame(rdd, df.schema)
         self.assertEqual(10, df3.count())