diff --git a/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala b/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala
index 86e94931300f8263d9a5751dfd1b42d65f0496ba..71b26737b8c029d5540d12ebf481d41ff37b9eba 100644
--- a/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala
+++ b/core/src/main/scala/org/apache/spark/api/java/JavaUtils.scala
@@ -80,7 +80,7 @@ private[spark] object JavaUtils {
           prev match {
             case Some(k) =>
               underlying match {
-                case mm: mutable.Map[a, _] =>
+                case mm: mutable.Map[A, _] =>
                   mm remove k
                   prev = None
                 case _ =>