diff --git a/mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala b/mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala
index f4e597e4ea9e7..ff132e2a29a89 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/util/SchemaUtils.scala
@@ -17,8 +17,6 @@
 
 package org.apache.spark.ml.util
 
-import scala.collection.immutable
-
 import org.apache.spark.SparkIllegalArgumentException
 import org.apache.spark.ml.attribute._
 import org.apache.spark.ml.linalg.VectorUDT