diff --git a/commons-datastore/commons-datastore-mongodb/src/main/java/org/opencb/commons/datastore/mongodb/MongoDBIterator.java b/commons-datastore/commons-datastore-mongodb/src/main/java/org/opencb/commons/datastore/mongodb/MongoDBIterator.java
index 9d0de564..55661c66 100644
--- a/commons-datastore/commons-datastore-mongodb/src/main/java/org/opencb/commons/datastore/mongodb/MongoDBIterator.java
+++ b/commons-datastore/commons-datastore-mongodb/src/main/java/org/opencb/commons/datastore/mongodb/MongoDBIterator.java
@@ -13,6 +13,10 @@ public class MongoDBIterator<E> implements Iterator<E>, Closeable {
     private ComplexTypeConverter<E, Document> converter;
     private long numMatches;
 
+    public MongoDBIterator(MongoCursor<Document> iterator, long numMatches) {
+        this(iterator, null, numMatches);
+    }
+
     public MongoDBIterator(MongoCursor<Document> iterator, ComplexTypeConverter<E, Document> converter, long numMatches) {
         this.iterator = iterator;
         this.converter = converter;