diff --git a/lib/include.js b/lib/include.js
index d3428e33..b6cd5d5f 100644
--- a/lib/include.js
+++ b/lib/include.js
@@ -494,9 +494,9 @@ Inclusion.include = function (objects, include, options, cb) {
      */
     function includeHasManySimple(callback) {
       //Map for Indexing objects by their id for faster retrieval
-      var objIdMap = includeUtils.buildOneToOneIdentityMap(objs, relation.keyFrom);
+      var objIdMap2 = includeUtils.buildOneToOneIdentityMapWithOrigKeys(objs, relation.keyFrom);
       // all ids of primary objects to use in query
-      var sourceIds = Object.keys(objIdMap);
+      var sourceIds = objIdMap2.originalKeys;//Object.keys(objIdMap);
 
       filter.where[relation.keyTo] = {
         inq: uniq(sourceIds)
@@ -510,7 +510,7 @@ Inclusion.include = function (objects, include, options, cb) {
           return callback(err);
         }
         var targetsIdMap = includeUtils.buildOneToManyIdentityMap(targets, relation.keyTo);
-        includeUtils.join(objIdMap, targetsIdMap, function(obj1, valueToMergeIn){
+        includeUtils.join(objIdMap2.simplified, targetsIdMap, function(obj1, valueToMergeIn){
           defineCachedRelations(obj1);
           obj1.__cachedRelations[relationName] = valueToMergeIn;
           processTargetObj(obj1, function(){});
@@ -845,7 +845,7 @@ Inclusion.include = function (objects, include, options, cb) {
      * @returns {*}
      */
     function processTargetObj(obj, callback) {
-      
+
       var isInst = obj instanceof self;
 
       // Calling the relation method on the instance
diff --git a/lib/include_utils.js b/lib/include_utils.js
index 8da849db..52e1be0f 100644
--- a/lib/include_utils.js
+++ b/lib/include_utils.js
@@ -29,7 +29,7 @@ function buildOneToOneIdentityMap(objs, idName) {
  * @param origKeyField filed name on value side to pick original key from.
  * @returns empty object to be filled with key-value pair and additional methods `keys` and `originalKeys`
  */
-function newIdMap(origKeyField) {
+function newIdMap(origKeyField, valueField) {
   //var idMap = Object.create(null); // not any single properties within our identity map
   var idMap = {};
   Object.defineProperty(idMap, "keys", {    // can ask for keys simply by idMap.keys
@@ -48,6 +48,17 @@ function newIdMap(origKeyField) {
     },
     enumerable: false // explicitly non-enumerable
   });
+  Object.defineProperty(idMap, "simplified",{
+    get: function(){
+      var keys = this.keys;
+      var simplified = {};
+      for(var i = 0; i < keys.length; i++) {
+        var key = keys[i];
+        simplified[key] = this[key][valueField];
+      }
+      return simplified;
+    }
+  });
   return idMap;
 }
 /**
@@ -59,7 +70,7 @@ function newIdMap(origKeyField) {
  * @returns {{}} object where keys are ids and values are objects itself
  */
 function buildOneToOneIdentityMapWithOrigKeys(objs, idName) {
-  var idMap = newIdMap("originalKey");
+  var idMap = newIdMap("originalKey", "value");
 
   for(var i = 0; i < objs.length; i++) {
     var obj = objs[i];