diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/OduSignalTypeCriterion.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/OduSignalTypeCriterion.java
index d92880d..f485433 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/OduSignalTypeCriterion.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/OduSignalTypeCriterion.java
@@ -74,7 +74,7 @@
 
     @Override
     public String toString() {
-        return toStringHelper(type().toString())
+        return toStringHelper(this)
                 .add("signalType", signalType)
                 .toString();
     }