diff --git a/modules/ripple_data/protocol/ripple_SerializedObject.cpp b/modules/ripple_data/protocol/ripple_SerializedObject.cpp
index 82ce1284a..5a07dd568 100644
--- a/modules/ripple_data/protocol/ripple_SerializedObject.cpp
+++ b/modules/ripple_data/protocol/ripple_SerializedObject.cpp
@@ -379,7 +379,10 @@ bool STObject::isEquivalent (const SerializedType& t) const
     const STObject* v = dynamic_cast<const STObject*> (&t);
 
     if (!v)
+    {
+        WriteLog (lsDEBUG, STObject) << "notEquiv " << getFullText() << " not object";
         return false;
+    }
 
     boost::ptr_vector<SerializedType>::const_iterator it1 = mData.begin (), end1 = mData.end ();
     boost::ptr_vector<SerializedType>::const_iterator it2 = v->mData.begin (), end2 = v->mData.end ();
@@ -387,7 +390,19 @@ bool STObject::isEquivalent (const SerializedType& t) const
     while ((it1 != end1) && (it2 != end2))
     {
         if ((it1->getSType () != it2->getSType ()) || !it1->isEquivalent (*it2))
+        {
+            if (it1->getSType () != it2->getSType ())
+            {
+                WriteLog (lsDEBUG, STObject) << "notEquiv type " << it1->getFullText() << " != "
+                    <<  it2->getFullText();
+            }
+            else
+            {
+                WriteLog (lsDEBUG, STObject) << "notEquiv " << it1->getFullText() << " != "
+                    <<  it2->getFullText();
+            }
             return false;
+        }
 
         ++it1;
         ++it2;
@@ -1164,7 +1179,10 @@ bool STArray::isEquivalent (const SerializedType& t) const
     const STArray* v = dynamic_cast<const STArray*> (&t);
 
     if (!v)
+    {
+        WriteLog (lsDEBUG, STObject) << "notEquiv " << getFullText() << " not array";
         return false;
+    }
 
     return value == v->value;
 }
diff --git a/modules/ripple_data/protocol/ripple_SerializedTypes.cpp b/modules/ripple_data/protocol/ripple_SerializedTypes.cpp
index 43ae0bbba..eaacad42e 100644
--- a/modules/ripple_data/protocol/ripple_SerializedTypes.cpp
+++ b/modules/ripple_data/protocol/ripple_SerializedTypes.cpp
@@ -22,6 +22,14 @@ SerializedType& SerializedType::operator= (const SerializedType& t)
     return *this;
 }
 
+bool SerializedType::isEquivalent (const SerializedType& t) const
+{
+    assert (getSType () == STI_NOTPRESENT);
+    if (t.getSType () == STI_NOTPRESENT)
+        return true;
+    WriteLog (lsDEBUG, SerializedType) << "notEquiv " << getFullText() << " not STI_NOTPRESENT";
+    return false;
+}
 
 void STPathSet::printDebug ()
 {
diff --git a/modules/ripple_data/protocol/ripple_SerializedTypes.h b/modules/ripple_data/protocol/ripple_SerializedTypes.h
index 20eff2c06..5137d21be 100644
--- a/modules/ripple_data/protocol/ripple_SerializedTypes.h
+++ b/modules/ripple_data/protocol/ripple_SerializedTypes.h
@@ -113,11 +113,7 @@ public:
         ;
     }
 
-    virtual bool isEquivalent (const SerializedType& t) const
-    {
-        assert (getSType () == STI_NOTPRESENT);
-        return t.getSType () == STI_NOTPRESENT;
-    }
+    virtual bool isEquivalent (const SerializedType& t) const;
 
     void addFieldID (Serializer& s) const
     {