diff --git a/src/go/pt-mongodb-query-digest/main.go b/src/go/pt-mongodb-query-digest/main.go
index f3a1021c..d78c578f 100644
--- a/src/go/pt-mongodb-query-digest/main.go
+++ b/src/go/pt-mongodb-query-digest/main.go
@@ -464,7 +464,7 @@ func getData(i iter, filters []docsFilter) []stat {
 			if s, ok = stats[key]; !ok {
 				realQuery, _ := getQueryField(doc.Query)
 				s = &stat{
-					ID:          fmt.Sprintf("%x", md5.Sum([]byte(fp+doc.Ns))),
+					ID:          fmt.Sprintf("%x", md5.Sum([]byte(key))),
 					Operation:   doc.Op,
 					Fingerprint: fp,
 					Namespace:   doc.Ns,