diff --git a/providers/bgp/topology/src/test/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProviderTest.java b/providers/bgp/topology/src/test/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProviderTest.java
index 30a3886..9e1992e 100644
--- a/providers/bgp/topology/src/test/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProviderTest.java
+++ b/providers/bgp/topology/src/test/java/org/onosproject/provider/bgp/topology/impl/BgpTopologyProviderTest.java
@@ -107,7 +107,7 @@
  */
 public class BgpTopologyProviderTest {
     private static final DeviceId DID2 = DeviceId.deviceId("l3:rd=0::routinguniverse=0:asn=10");
-    private static final String UNKNOWN = new String("unknown");
+    private static final String UNKNOWN = "unknown";
     public static ProviderId providerId = new ProviderId("l3", "foo");
     private static final NodeId NODE1 = new NodeId("Master1");
 
diff --git a/providers/pcep/topology/src/test/java/org/onosproject/provider/pcep/topology/impl/PcepTopologyProviderTest.java b/providers/pcep/topology/src/test/java/org/onosproject/provider/pcep/topology/impl/PcepTopologyProviderTest.java
index 2f8827c..afabe2b 100644
--- a/providers/pcep/topology/src/test/java/org/onosproject/provider/pcep/topology/impl/PcepTopologyProviderTest.java
+++ b/providers/pcep/topology/src/test/java/org/onosproject/provider/pcep/topology/impl/PcepTopologyProviderTest.java
@@ -66,7 +66,7 @@
  * Test for PCEP topology provider.
  */
 public class PcepTopologyProviderTest {
-    private static final String UNKNOWN = new String("unknown");
+    private static final String UNKNOWN = "unknown";
     public static ProviderId providerId = new ProviderId("l3", "foo");
     private final PcepClientControllerAdapter clientController = new PcepClientControllerAdapter();
     private final PcepTopologyProvider provider = new PcepTopologyProvider();