diff --git a/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java b/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
index 6e4de12..0d7d4c9 100644
--- a/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
+++ b/src/main/java/org/onosproject/segmentrouting/RoutingRulePopulator.java
@@ -141,7 +141,7 @@
      * @return true if all rules are set successfully, false otherwise
      */
     public boolean populateIpRuleForSubnet(DeviceId deviceId,
-                                           List<Ip4Prefix> subnets,
+                                           Set<Ip4Prefix> subnets,
                                            DeviceId destSw,
                                            Set<DeviceId> nextHops) {