diff --git a/app/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java b/app/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
index 070a7ec..0282fa4 100644
--- a/app/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
+++ b/app/src/main/java/org/onosproject/segmentrouting/config/DeviceConfiguration.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Multimaps;
 import com.google.common.collect.SetMultimap;
 import org.onlab.packet.Ip4Address;
 import org.onlab.packet.Ip6Address;
@@ -81,8 +82,8 @@
         int pwRoutingLabel;
 
         public SegmentRouterInfo() {
-            gatewayIps = HashMultimap.create();
-            subnets = HashMultimap.create();
+            gatewayIps = Multimaps.synchronizedSetMultimap(HashMultimap.create());
+            subnets = Multimaps.synchronizedSetMultimap(HashMultimap.create());
         }
     }