diff --git a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/completer/StringsCompleter.java b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/completer/StringsCompleter.java
index a4526622c59..1da78001507 100644
--- a/zeppelin-interpreter/src/main/java/org/apache/zeppelin/completer/StringsCompleter.java
+++ b/zeppelin-interpreter/src/main/java/org/apache/zeppelin/completer/StringsCompleter.java
@@ -28,12 +28,7 @@
  * Case-insensitive completer for a set of strings.
  */
 public class StringsCompleter implements Completer {
-  private final SortedSet<String> strings = new TreeSet<>(new Comparator<String>() {
-    @Override
-    public int compare(String o1, String o2) {
-      return o1.compareToIgnoreCase(o2);
-    }
-  });
+  private final SortedSet<String> strings = new TreeSet<>(String::compareToIgnoreCase);
 
   public StringsCompleter() {
   }