diff --git a/lib/include_utils.js b/lib/include_utils.js
index e0788dd8..528d855f 100644
--- a/lib/include_utils.js
+++ b/lib/include_utils.js
@@ -1,26 +1,7 @@
-module.exports.buildOneToOneIdentityMap = buildOneToOneIdentityMap;
-module.exports.buildOneToManyIdentityMap = buildOneToManyIdentityMap;
 module.exports.buildOneToOneIdentityMapWithOrigKeys = buildOneToOneIdentityMapWithOrigKeys;
 module.exports.buildOneToManyIdentityMapWithOrigKeys = buildOneToManyIdentityMapWithOrigKeys;
 module.exports.join = join;
 module.exports.KVMap = KVMap;
-/**
- * Effectively builds associative map on id -> object relation.
- * Map returned in form of object with ids in keys and object as values.
- * @param objs array of objects to build from
- * @param idName name of property to be used as id. Such property considered to be unique across array.
- * In case of collisions last wins. For non-unique ids use buildOneToManyIdentityMap()
- * @returns {{}} object where keys are ids and values are objects itself
- */
-function buildOneToOneIdentityMap(objs, idName) {
-  var idMap = {};
-  for(var i = 0; i < objs.length; i++) {
-    var obj = objs[i];
-    var id = obj[idName].toString();
-    idMap[id] = obj;
-  }
-  return idMap;
-}
 
 /**
  * Effectively builds associative map on id -> object relation and stores original keys.
@@ -40,26 +21,6 @@ function buildOneToOneIdentityMapWithOrigKeys(objs, idName) {
   return kvMap;
 }
 
-/**
- * Effectively builds associate map on id -> Array[Object].
- * Map returned in form of object with ids in keys and array of objects with given id.
- * @param objs array of objects to build from
- * @param idName name of property to be used as id
- */
-function buildOneToManyIdentityMap(objs, idName) {
-  var idMap = {};
-  for(var i = 0; i < objs.length; i++) {
-    var obj = objs[i];
-    var id = obj[idName].toString();
-    if(id in idMap) {
-      idMap[id].push(obj);
-    } else {
-      idMap[id] = [obj];
-    }
-  }
-  return idMap;
-}
-
 function buildOneToManyIdentityMapWithOrigKeys(objs, idName) {
   var kvMap = new KVMap();
   for(var i = 0; i < objs.length; i++) {
diff --git a/test/include_util.test.js b/test/include_util.test.js
index 3cbe6fa9..280bd5eb 100644
--- a/test/include_util.test.js
+++ b/test/include_util.test.js
@@ -4,16 +4,15 @@ var should = require("should");
 var includeUtils = require("../lib/include_utils");
 
 describe('include_util', function(){
-  describe('#buildOneToOneIdentityMap', function(){
+  describe('#buildOneToOneIdentityMapWithOrigKeys', function(){
     it('should return an object with keys', function(){
       var objs = [
           {id: 11, letter: "A"},
           {id: 22, letter: "B"}
       ];
-      var result = includeUtils.buildOneToOneIdentityMap(objs, "id");
-      result.should.be.an.instanceOf(Object);
-      result.should.have.property("11");
-      result.should.have.property("22");
+      var result = includeUtils.buildOneToOneIdentityMapWithOrigKeys(objs, "id");
+      result.get(11).should.be.ok;
+      result.get(22).should.be.ok;
     });
 
     it('should overwrite keys in case of collision', function(){
@@ -24,11 +23,12 @@ describe('include_util', function(){
             {id: 11, letter: "HA!"}
         ];
 
-        var result = includeUtils.buildOneToOneIdentityMap(objs, "id");
-        result.should.be.an.instanceOf(Object);
-        result.should.have.keys("11", "22", "33");
-        result["11"]["letter"].should.equal("HA!");
-        result["33"]["letter"].should.equal("C");
+        var result = includeUtils.buildOneToOneIdentityMapWithOrigKeys(objs, "id");
+        result.getKeys().should.containEql(11);
+        result.getKeys().should.containEql(22);
+        result.getKeys().should.containEql(33);
+        result.get(11)["letter"].should.equal("HA!");
+        result.get(33)["letter"].should.equal("C");
     });
   });
   describe('#buildOneToOneIdentityMapWithOrigKeys', function(){
@@ -49,9 +49,9 @@ describe('include_util', function(){
                 {id: 11, letter: "A"},
                 {id: 22, letter: "B"}
             ];
-            var result = includeUtils.buildOneToManyIdentityMap(objs, "id");
-            result.should.be.an.instanceOf(Object);
-            result.should.have.keys("11", "22");
+            var result = includeUtils.buildOneToManyIdentityMapWithOrigKeys(objs, "id");
+            result.exist(11).should.be.true;
+            result.exist(22).should.be.true;
         });
 
         it('should collect keys in case of collision', function(){
@@ -62,12 +62,10 @@ describe('include_util', function(){
                 {fk_id: 11, letter: "HA!"}
             ];
 
-            var result = includeUtils.buildOneToManyIdentityMap(objs, "fk_id");
-            result.should.be.an.instanceOf(Object);
-            result.should.have.keys("11", "22", "33");
-            result["11"][0]["letter"].should.equal("A");
-            result["11"][1]["letter"].should.equal("HA!");
-            result["33"][0]["letter"].should.equal("C");
+            var result = includeUtils.buildOneToManyIdentityMapWithOrigKeys(objs, "fk_id");
+            result.get(11)[0]["letter"].should.equal("A");
+            result.get(11)[1]["letter"].should.equal("HA!");
+            result.get(33)[0]["letter"].should.equal("C");
         });
     });
 });