diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/PortCriterion.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/PortCriterion.java
index f07cd50..4221451 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/PortCriterion.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/PortCriterion.java
@@ -19,8 +19,6 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.MoreObjects.toStringHelper;
-
 /**
  * Implementation of input port criterion.
  */
@@ -56,8 +54,7 @@
 
     @Override
     public String toString() {
-        return toStringHelper(type().toString())
-                .add("port", port).toString();
+        return type().toString() + SEPARATOR + port;
     }
 
     @Override