diff --git a/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java b/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
index d8997dc..540c47d 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/topology/web/RouteResource.java
@@ -40,7 +40,7 @@
         String dstDpidStr = (String) getRequestAttributes().get("dst-dpid");
         String dstPortStr = (String) getRequestAttributes().get("dst-port");
 
-        log.debug( srcDpidStr + "--" + srcPortStr + "--" + dstDpidStr + "--" + dstPortStr);
+        log.debug( "{}--{}--{}--{}", srcDpidStr, srcPortStr, dstDpidStr, dstPortStr);
 
 	Dpid srcDpid = new Dpid(srcDpidStr);
 	Port srcPort = new Port(Short.parseShort(srcPortStr));