diff --git a/core/api/src/main/java/org/onosproject/net/flow/criteria/IPv6ExthdrFlagsCriterion.java b/core/api/src/main/java/org/onosproject/net/flow/criteria/IPv6ExthdrFlagsCriterion.java
index 2463bf6..ee73c52 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/criteria/IPv6ExthdrFlagsCriterion.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/criteria/IPv6ExthdrFlagsCriterion.java
@@ -17,8 +17,6 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.MoreObjects.toStringHelper;
-
 /**
  * Implementation of IPv6 Extension Header pseudo-field criterion
  * (16 bits). Those are defined in Criterion.IPv6ExthdrFlags.
@@ -54,8 +52,7 @@
 
     @Override
     public String toString() {
-        return toStringHelper(type().toString())
-            .add("exthdrFlags", Long.toHexString(exthdrFlags)).toString();
+        return type().toString() + SEPARATOR + Long.toHexString(exthdrFlags);
     }
 
     @Override