diff --git a/lib/connectors/memory.js b/lib/connectors/memory.js
index 7af66e29..c974a0b9 100644
--- a/lib/connectors/memory.js
+++ b/lib/connectors/memory.js
@@ -117,7 +117,7 @@ Memory.prototype.fromDb = function(model, data) {
     if (!data) return null;
     data = JSON.parse(data);
     var props = this._models[model].properties;
-    Object.keys(data).forEach(function (key) {
+    for(var key in data) {
         var val = data[key];
         if (typeof val === 'undefined' || val === null) {
             return;
@@ -136,7 +136,7 @@ Memory.prototype.fromDb = function(model, data) {
             }
         }
         data[key] = val;
-    });
+    }
     return data;
 };
 
diff --git a/lib/dao.js b/lib/dao.js
index 9bee58a3..6d2675f9 100644
--- a/lib/dao.js
+++ b/lib/dao.js
@@ -58,14 +58,14 @@ DataAccessObject._forDB = function (data) {
         return data;
     }
     var res = {};
-    Object.keys(data).forEach(function (propName) {
+    for(var propName in data) {
         var type = this.getPropertyType(propName);
         if (type === 'JSON' || type === 'Any' || type === 'Object' || data[propName] instanceof Array) {
             res[propName] = JSON.stringify(data[propName]);
         } else {
             res[propName] = data[propName];
         }
-    }.bind(this));
+    }
     return res;
 };
 
@@ -700,9 +700,9 @@ DataAccessObject.prototype.updateAttributes = function updateAttributes(data, cb
     }
 
     // update instance's properties
-    Object.keys(data).forEach(function (key) {
+    for(var key in data) {
         inst[key] = data[key];
-    });
+    }
 
     inst.isValid(function (valid) {
         if (!valid) {
@@ -713,16 +713,16 @@ DataAccessObject.prototype.updateAttributes = function updateAttributes(data, cb
             inst.trigger('save', function (saveDone) {
                 inst.trigger('update', function (done) {
 
-                    Object.keys(data).forEach(function (key) {
+                    for(var key in data) {
                         inst[key] = data[key];
-                    });
+                    }
 
                     inst._adapter().updateAttributes(model, getIdValue(inst.constructor, inst), inst.constructor._forDB(data), function (err) {
                         if (!err) {
                             // update $was attrs
-                            Object.keys(data).forEach(function (key) {
+                            for(var key in data) {
                                 inst.__dataWas[key] = inst.__data[key];
-                            });
+                            };
                         }
                         done.call(inst, function () {
                             saveDone.call(inst, function () {
diff --git a/lib/model.js b/lib/model.js
index 766f7d45..88a8ceb3 100644
--- a/lib/model.js
+++ b/lib/model.js
@@ -99,20 +99,20 @@ ModelBaseClass.prototype._initProperties = function (data, applySetters) {
     }
 
     if (applySetters === true) {
-        Object.keys(data).forEach(function (propertyName) {
+        for(var propertyName in data) {
             if((propertyName in properties) || (propertyName in ctor.relations)) {
                 self[propertyName] = self.__data[propertyName] || data[propertyName];
             }
-        });
+        }
     }
 
     // Set the unknown properties as properties to the object
     if(strict === false) {
-        Object.keys(data).forEach(function (propertyName) {
+        for(var propertyName in data) {
             if(!(propertyName in properties)) {
                 self[propertyName] = self.__data[propertyName] || data[propertyName];
             }
-        });
+        }
     }
 
     ctor.forEachProperty(function (propertyName) {
@@ -224,7 +224,7 @@ ModelBaseClass.prototype.toObject = function (onlySchema) {
     });
 
     if (schemaLess) {
-        Object.keys(self.__data).forEach(function (propertyName) {
+            for(var propertyName in self.__data) {
             if (!data.hasOwnProperty(propertyName)) {
                 var val = self.hasOwnProperty(propertyName) ? self[propertyName] : self.__data[propertyName];
                 if(val !== undefined && val!== null && val.toObject) {
@@ -233,7 +233,7 @@ ModelBaseClass.prototype.toObject = function (onlySchema) {
                     data[propertyName] = val;
                 }
             }
-        });
+        }
     }
     return data;
 };
@@ -248,9 +248,9 @@ ModelBaseClass.prototype.toJSON = function () {
 };
 
 ModelBaseClass.prototype.fromObject = function (obj) {
-    Object.keys(obj).forEach(function (key) {
+    for(var key in obj) {
         this[key] = obj[key];
-    }.bind(this));
+    }
 };
 
 /**
@@ -271,14 +271,14 @@ ModelBaseClass.prototype.propertyChanged = function propertyChanged(propertyName
  */
 ModelBaseClass.prototype.reset = function () {
     var obj = this;
-    Object.keys(obj).forEach(function (k) {
+    for(var k in obj) {
         if (k !== 'id' && !obj.constructor.dataSource.definitions[obj.constructor.modelName].properties[k]) {
             delete obj[k];
         }
         if (obj.propertyChanged(k)) {
             obj[k] = obj[k + '$was'];
         }
-    });
+    }
 };
 
 ModelBaseClass.prototype.inspect = function () {