diff --git a/core/src/test/scala/org/apache/spark/TestUtils.scala b/core/src/test/scala/org/apache/spark/TestUtils.scala
index de7b2a1cb47dd..667cf84503544 100644
--- a/core/src/test/scala/org/apache/spark/TestUtils.scala
+++ b/core/src/test/scala/org/apache/spark/TestUtils.scala
@@ -114,7 +114,7 @@ object TestUtils {
   def createCompiledClassWithValue(className: String, value: Integer, destDir: File): File = {
     val compiler = ToolProvider.getSystemJavaCompiler
     val sourceFile = new JavaSourceFromString(className,
-      "public class " + className + " { override String toString() { return \"" + value + "\";}}")
+      "public class " + className + " { @Override public String toString() { return \"" + value + "\";}}")
 
     // Calling this outputs a class file in pwd. It's easier to just rename the file than
     // build a custom FileManager that controls the output location.