diff --git a/helix-rest/src/main/java/org/apache/helix/rest/server/service/InstanceServiceImpl.java b/helix-rest/src/main/java/org/apache/helix/rest/server/service/InstanceServiceImpl.java
index 1f3ba88468..59d1a37c0b 100644
--- a/helix-rest/src/main/java/org/apache/helix/rest/server/service/InstanceServiceImpl.java
+++ b/helix-rest/src/main/java/org/apache/helix/rest/server/service/InstanceServiceImpl.java
@@ -20,7 +20,6 @@
  */
 
 import java.io.IOException;
-import java.util.Collections;
 import java.util.List;
 import java.util.Map;