diff --git a/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java b/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
index bf65033..05bd6cb 100644
--- a/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
+++ b/core/api/src/main/java/org/onosproject/net/mcast/MulticastRouteService.java
@@ -19,7 +19,7 @@
 import org.onosproject.event.ListenerService;
 import org.onosproject.net.ConnectPoint;
 
-import java.util.List;
+import java.util.Set;
 
 /**
  * A service interface for maintaining multicast information.
@@ -82,5 +82,5 @@
      * @param route a multicast route
      * @return a list of connect points
      */
-    List<ConnectPoint> fetchSinks(McastRoute route);
+    Set<ConnectPoint> fetchSinks(McastRoute route);
 }