diff --git a/core/src/test/scala/org/apache/spark/deploy/rest/SubmitRestProtocolSuite.scala b/core/src/test/scala/org/apache/spark/deploy/rest/SubmitRestProtocolSuite.scala
index 7b2d1c296e88a..725b8848bc052 100644
--- a/core/src/test/scala/org/apache/spark/deploy/rest/SubmitRestProtocolSuite.scala
+++ b/core/src/test/scala/org/apache/spark/deploy/rest/SubmitRestProtocolSuite.scala
@@ -246,7 +246,7 @@ class SubmitRestProtocolSuite extends SparkFunSuite {
       |    "spark.driver.supervise" : "false",
       |    "spark.app.name" : "SparkPie",
       |    "spark.cores.max" : "10000",
-      |    "spark.driver.memory" : ${Utils.DEFAULT_DRIVER_MEM_MB}m",
+      |    "spark.driver.memory" : "${Utils.DEFAULT_DRIVER_MEM_MB}m",
       |    "spark.files" : "fireball.png",
       |    "spark.driver.cores" : "180",
       |    "spark.driver.extraJavaOptions" : " -Dslices=5 -Dcolor=mostly_red",