diff --git a/query/gremlin/finals.go b/query/gremlin/finals.go
index a82da13..6979e22 100644
--- a/query/gremlin/finals.go
+++ b/query/gremlin/finals.go
@@ -210,6 +210,7 @@ func runIteratorToArrayNoTags(it graph.Iterator, ses *Session, limit int) []stri
 func runIteratorWithCallback(it graph.Iterator, ses *Session, callback otto.Value, this otto.FunctionCall, limit int) {
 	count := 0
 	it, _ = it.Optimize()
+	glog.V(2).Infoln(it.DebugString(0))
 	for {
 		select {
 		case <-ses.kill:
diff --git a/query/gremlin/session.go b/query/gremlin/session.go
index 8000c17..9e329c2 100644
--- a/query/gremlin/session.go
+++ b/query/gremlin/session.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/robertkrimen/otto"
+	_ "github.com/robertkrimen/otto/underscore"
 
 	"github.com/google/cayley/graph"
 	"github.com/google/cayley/query"