diff --git a/src/main/java/net/onrc/onos/core/intent/runtime/PathCalcRuntimeModule.java b/src/main/java/net/onrc/onos/core/intent/runtime/PathCalcRuntimeModule.java
index 4ba9b54..9ef1a1f 100755
--- a/src/main/java/net/onrc/onos/core/intent/runtime/PathCalcRuntimeModule.java
+++ b/src/main/java/net/onrc/onos/core/intent/runtime/PathCalcRuntimeModule.java
@@ -55,7 +55,7 @@
         }
     }
 
-    class PerfLogger {
+    static class PerfLogger {
         private LinkedList<PerfLog> logData = new LinkedList<>();
 
         public PerfLogger(String logPhase) {