diff --git a/dev/diffs/3.4.2.diff b/dev/diffs/3.4.2.diff
index 74449c7890..65acd99133 100644
--- a/dev/diffs/3.4.2.diff
+++ b/dev/diffs/3.4.2.diff
@@ -986,7 +986,7 @@ index 266bb343526..02b8763ad92 100644
 -          executedPlan.asInstanceOf[SortMergeJoinExec]
 +          executedPlan match {
 +            case s: SortMergeJoinExec => s
-+            case b: CometExec =>
++            case b: CometSortMergeJoinExec =>
 +              b.originalPlan match {
 +                case s: SortMergeJoinExec => s
 +                case o => fail(s"expected SortMergeJoinExec, but found\n$o")
@@ -1000,7 +1000,7 @@ index 266bb343526..02b8763ad92 100644
 +          executedPlan match {
 +            case s: SortMergeJoinExec => s
 +            case ColumnarToRowExec(child) =>
-+              child.asInstanceOf[CometExec].originalPlan match {
++              child.asInstanceOf[CometSortMergeJoinExec].originalPlan match {
 +                case s: SortMergeJoinExec => s
 +                case o => fail(s"expected SortMergeJoinExec, but found\n$o")
 +              }