diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
index 8d90614e4501a2685f078615fd70f3aa2767b590..5f8b6ae10f0c488ddaf54f92eaa0bbfcca45605e 100644
--- a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
+++ b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
@@ -89,6 +89,8 @@ case class Remainder(left: Expression, right: Expression) extends BinaryArithmet
 case class MaxOf(left: Expression, right: Expression) extends Expression {
   type EvaluatedType = Any
 
+  override def foldable = left.foldable && right.foldable
+
   override def nullable = left.nullable && right.nullable
 
   override def children = left :: right :: Nil