diff --git a/gluten-core/src/main/scala/io/glutenproject/execution/BasicPhysicalOperatorTransformer.scala b/gluten-core/src/main/scala/io/glutenproject/execution/BasicPhysicalOperatorTransformer.scala
index 6c5b57b33f63..6d200997705f 100644
--- a/gluten-core/src/main/scala/io/glutenproject/execution/BasicPhysicalOperatorTransformer.scala
+++ b/gluten-core/src/main/scala/io/glutenproject/execution/BasicPhysicalOperatorTransformer.scala
@@ -359,7 +359,7 @@ case class ProjectExecTransformer private (projectList: Seq[NamedExpression], ch
     throw new UnsupportedOperationException(s"This operator doesn't support doExecuteColumnar().")
   }
 
-  override protected def outputExpressions: Seq[NamedExpression] = output
+  override protected def outputExpressions: Seq[NamedExpression] = projectList
 
   override protected def doExecute()
       : org.apache.spark.rdd.RDD[org.apache.spark.sql.catalyst.InternalRow] = {