diff --git a/resource-managers/mesos/src/main/scala/org/apache/spark/deploy/rest/mesos/MesosRestServer.scala b/resource-managers/mesos/src/main/scala/org/apache/spark/deploy/rest/mesos/MesosRestServer.scala
index 68f6921153d8..de94ce6f55f3 100644
--- a/resource-managers/mesos/src/main/scala/org/apache/spark/deploy/rest/mesos/MesosRestServer.scala
+++ b/resource-managers/mesos/src/main/scala/org/apache/spark/deploy/rest/mesos/MesosRestServer.scala
@@ -74,7 +74,9 @@ private[mesos] class MesosSubmitRequestServlet(
    * This does not currently consider fields used by python applications since python
    * is not supported in mesos cluster mode yet.
    */
-  private def buildDriverDescription(request: CreateSubmissionRequest): MesosDriverDescription = {
+  // Visible for testing.
+  private[rest] def buildDriverDescription(
+      request: CreateSubmissionRequest): MesosDriverDescription = {
     // Required fields, including the main class because python is not yet supported
     val appResource = Option(request.appResource).getOrElse {
       throw new SubmitRestMissingFieldException("Application jar 'appResource' is missing.")
@@ -101,11 +103,15 @@ private[mesos] class MesosSubmitRequestServlet(
     val name = request.sparkProperties.getOrElse("spark.app.name", mainClass)
 
     // Construct driver description
-    val conf = new SparkConf(false).setAll(sparkProperties)
+    val defaultConf = this.conf.getAllWithPrefix("spark.mesos.dispatcher.driverDefault.").toMap
+    val driverConf = new SparkConf(false)
+      .setAll(defaultConf)
+      .setAll(sparkProperties)
+
     val extraClassPath = driverExtraClassPath.toSeq.flatMap(_.split(File.pathSeparator))
     val extraLibraryPath = driverExtraLibraryPath.toSeq.flatMap(_.split(File.pathSeparator))
     val extraJavaOpts = driverExtraJavaOptions.map(Utils.splitCommandString).getOrElse(Seq.empty)
-    val sparkJavaOpts = Utils.sparkJavaOpts(conf)
+    val sparkJavaOpts = Utils.sparkJavaOpts(driverConf)
     val javaOpts = sparkJavaOpts ++ extraJavaOpts
     val command = new Command(
       mainClass, appArgs, environmentVariables, extraClassPath, extraLibraryPath, javaOpts)
@@ -117,7 +123,7 @@ private[mesos] class MesosSubmitRequestServlet(
 
     new MesosDriverDescription(
       name, appResource, actualDriverMemory, actualDriverCores, actualSuperviseDriver,
-      command, request.sparkProperties, submissionId, submitDate)
+      command, driverConf.getAll.toMap, submissionId, submitDate)
   }
 
   protected override def handleSubmit(
diff --git a/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterScheduler.scala b/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterScheduler.scala
index c7f4e7e52c60..bc78f1b1edb3 100644
--- a/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterScheduler.scala
+++ b/resource-managers/mesos/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterScheduler.scala
@@ -535,12 +535,13 @@ private[spark] class MesosClusterScheduler(
       "spark.submit.deployMode", // this would be set to `cluster`, but we need client
       "spark.master" // this contains the address of the dispatcher, not master
     )
-    val defaultConf = conf.getAllWithPrefix("spark.mesos.dispatcher.driverDefault.").toMap
-    val driverConf = desc.conf.getAll
+
+    desc.conf.getAll
       .filter { case (key, _) => !replicatedOptionsBlacklist.contains(key) }
       .toMap
-    (defaultConf ++ driverConf).foreach { case (key, value) =>
-      options ++= Seq("--conf", s"$key=${shellEscape(value)}") }
+      .foreach { case (key, value) =>
+        options ++= Seq("--conf", s"$key=${shellEscape(value)}")
+      }
 
     options
   }
diff --git a/resource-managers/mesos/src/test/scala/org/apache/spark/deploy/rest/mesos/MesosSubmitRequestServletSuite.scala b/resource-managers/mesos/src/test/scala/org/apache/spark/deploy/rest/mesos/MesosSubmitRequestServletSuite.scala
new file mode 100644
index 000000000000..08bb48518820
--- /dev/null
+++ b/resource-managers/mesos/src/test/scala/org/apache/spark/deploy/rest/mesos/MesosSubmitRequestServletSuite.scala
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.deploy.rest.mesos
+
+import org.mockito.Mockito.mock
+
+import org.apache.spark.{SparkConf, SparkFunSuite}
+import org.apache.spark.deploy.TestPrematureExit
+import org.apache.spark.deploy.rest.CreateSubmissionRequest
+import org.apache.spark.scheduler.cluster.mesos.MesosClusterScheduler
+
+class MesosSubmitRequestServletSuite extends SparkFunSuite
+  with TestPrematureExit {
+
+  test("test buildDriverDescription applies default settings from dispatcher conf to Driver") {
+    val conf = new SparkConf(loadDefaults = false)
+
+    conf.set("spark.mesos.dispatcher.driverDefault.spark.mesos.network.name", "test_network")
+    conf.set("spark.mesos.dispatcher.driverDefault.spark.mesos.network.labels", "k0:v0,k1:v1")
+
+    val submitRequestServlet = new MesosSubmitRequestServlet(
+      scheduler = mock(classOf[MesosClusterScheduler]),
+      conf
+    )
+
+    val request = new CreateSubmissionRequest
+    request.appResource = "hdfs://test.jar"
+    request.mainClass = "foo.Bar"
+    request.appArgs = Array.empty[String]
+    request.sparkProperties = Map.empty[String, String]
+    request.environmentVariables = Map.empty[String, String]
+
+    val driverConf = submitRequestServlet.buildDriverDescription(request).conf
+
+    assert("test_network" == driverConf.get("spark.mesos.network.name"))
+    assert("k0:v0,k1:v1" == driverConf.get("spark.mesos.network.labels"))
+  }
+}