diff --git a/mllib/src/test/java/org/apache/spark/ml/feature/JavaDCTSuite.java b/mllib/src/test/java/org/apache/spark/ml/feature/JavaDCTSuite.java
index 34f8cbbe1eb62..87366ce002c10 100644
--- a/mllib/src/test/java/org/apache/spark/ml/feature/JavaDCTSuite.java
+++ b/mllib/src/test/java/org/apache/spark/ml/feature/JavaDCTSuite.java
@@ -66,7 +66,7 @@ public void javaCompatibilityTest() {
     double[] expectedResult = input.clone();
     (new DoubleDCT_1D(input.length)).forward(expectedResult, true);
 
-    DCT DCT = new DCT()
+    DCT dct = new DCT()
       .setInputCol("vec")
       .setOutputCol("resultVec");