diff --git a/core/src/main/scala/org/apache/spark/api/r/JVMObjectTracker.scala b/core/src/main/scala/org/apache/spark/api/r/JVMObjectTracker.scala
index 3432700f11602..fe7438ac54f18 100644
--- a/core/src/main/scala/org/apache/spark/api/r/JVMObjectTracker.scala
+++ b/core/src/main/scala/org/apache/spark/api/r/JVMObjectTracker.scala
@@ -37,13 +37,7 @@ private[r] class JVMObjectTracker {
   /**
    * Returns the JVM object associated with the input key or None if not found.
    */
-  final def get(id: JVMObjectId): Option[Object] = this.synchronized {
-    if (objMap.containsKey(id)) {
-      Some(objMap.get(id))
-    } else {
-      None
-    }
-  }
+  final def get(id: JVMObjectId): Option[Object] = Option(objMap.get(id))
 
   /**
    * Returns the JVM object associated with the input key or throws an exception if not found.
@@ -67,13 +61,7 @@ private[r] class JVMObjectTracker {
   /**
    * Removes and returns a JVM object with the specific ID from the tracker, or None if not found.
    */
-  final def remove(id: JVMObjectId): Option[Object] = this.synchronized {
-    if (objMap.containsKey(id)) {
-      Some(objMap.remove(id))
-    } else {
-      None
-    }
-  }
+  final def remove(id: JVMObjectId): Option[Object] = Option(objMap.remove(id))
 
   /**
    * Number of JVM objects being tracked.