diff --git a/connector/connect/common/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala b/connector/connect/common/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
index d3fc9963edc7..810158b2ac8b 100644
--- a/connector/connect/common/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
+++ b/connector/connect/common/src/main/scala/org/apache/spark/sql/connect/client/CloseableIterator.scala
@@ -48,9 +48,9 @@ private[sql] object CloseableIterator {
    */
   def apply[T](iterator: Iterator[T]): CloseableIterator[T] = iterator match {
     case closeable: CloseableIterator[T] => closeable
-    case _ =>
+    case iter =>
       new WrappedCloseableIterator[T] {
-        override def innerIterator = iterator
+        override def innerIterator: Iterator[T] = iter
       }
   }
 }