diff --git a/packages/core-js-pure/override/internals/collection.js b/packages/core-js-pure/override/internals/collection.js
index 7c77c5c711fd..a50e89232496 100644
--- a/packages/core-js-pure/override/internals/collection.js
+++ b/packages/core-js-pure/override/internals/collection.js
@@ -16,10 +16,12 @@ var InternalStateModule = require('../internals/internal-state');
 var setInternalState = InternalStateModule.set;
 var internalStateGetterFor = InternalStateModule.getterFor;
 
-module.exports = function (CONSTRUCTOR_NAME, wrapper, common, IS_MAP, IS_WEAK) {
+module.exports = function (CONSTRUCTOR_NAME, wrapper, common) {
+  var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
+  var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
+  var ADDER = IS_MAP ? 'set' : 'add';
   var NativeConstructor = global[CONSTRUCTOR_NAME];
   var NativePrototype = NativeConstructor && NativeConstructor.prototype;
-  var ADDER = IS_MAP ? 'set' : 'add';
   var exported = {};
   var Constructor;
 
diff --git a/packages/core-js/internals/collection.js b/packages/core-js/internals/collection.js
index 776c6d3ade73..f9ac89100fe2 100644
--- a/packages/core-js/internals/collection.js
+++ b/packages/core-js/internals/collection.js
@@ -12,11 +12,13 @@ var checkCorrectnessOfIteration = require('../internals/check-correctness-of-ite
 var setToStringTag = require('../internals/set-to-string-tag');
 var inheritIfRequired = require('../internals/inherit-if-required');
 
-module.exports = function (CONSTRUCTOR_NAME, wrapper, common, IS_MAP, IS_WEAK) {
+module.exports = function (CONSTRUCTOR_NAME, wrapper, common) {
+  var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
+  var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
+  var ADDER = IS_MAP ? 'set' : 'add';
   var NativeConstructor = global[CONSTRUCTOR_NAME];
   var NativePrototype = NativeConstructor && NativeConstructor.prototype;
   var Constructor = NativeConstructor;
-  var ADDER = IS_MAP ? 'set' : 'add';
   var exported = {};
 
   var fixMethod = function (KEY) {
diff --git a/packages/core-js/modules/es.map.js b/packages/core-js/modules/es.map.js
index ea5f598d8c58..fa8ecce40f50 100644
--- a/packages/core-js/modules/es.map.js
+++ b/packages/core-js/modules/es.map.js
@@ -4,6 +4,6 @@ var collectionStrong = require('../internals/collection-strong');
 
 // `Map` constructor
 // https://tc39.github.io/ecma262/#sec-map-objects
-module.exports = collection('Map', function (get) {
-  return function Map() { return get(this, arguments.length ? arguments[0] : undefined); };
-}, collectionStrong, true);
+module.exports = collection('Map', function (init) {
+  return function Map() { return init(this, arguments.length ? arguments[0] : undefined); };
+}, collectionStrong);
diff --git a/packages/core-js/modules/es.set.js b/packages/core-js/modules/es.set.js
index 962dc8185b8b..ac9004139ffa 100644
--- a/packages/core-js/modules/es.set.js
+++ b/packages/core-js/modules/es.set.js
@@ -4,6 +4,6 @@ var collectionStrong = require('../internals/collection-strong');
 
 // `Set` constructor
 // https://tc39.github.io/ecma262/#sec-set-objects
-module.exports = collection('Set', function (get) {
-  return function Set() { return get(this, arguments.length ? arguments[0] : undefined); };
+module.exports = collection('Set', function (init) {
+  return function Set() { return init(this, arguments.length ? arguments[0] : undefined); };
 }, collectionStrong);
diff --git a/packages/core-js/modules/es.weak-map.js b/packages/core-js/modules/es.weak-map.js
index 89784bbcefc4..38f2f72fdd9a 100644
--- a/packages/core-js/modules/es.weak-map.js
+++ b/packages/core-js/modules/es.weak-map.js
@@ -12,15 +12,15 @@ var IS_IE11 = !global.ActiveXObject && 'ActiveXObject' in global;
 var isExtensible = Object.isExtensible;
 var InternalWeakMap;
 
-var wrapper = function (get) {
+var wrapper = function (init) {
   return function WeakMap() {
-    return get(this, arguments.length ? arguments[0] : undefined);
+    return init(this, arguments.length ? arguments[0] : undefined);
   };
 };
 
 // `WeakMap` constructor
 // https://tc39.github.io/ecma262/#sec-weakmap-constructor
-var $WeakMap = module.exports = collection('WeakMap', wrapper, collectionWeak, true, true);
+var $WeakMap = module.exports = collection('WeakMap', wrapper, collectionWeak);
 
 // IE11 WeakMap frozen keys fix
 // We can't use feature detection because it crash some old IE builds
diff --git a/packages/core-js/modules/es.weak-set.js b/packages/core-js/modules/es.weak-set.js
index a412aa557a88..ef6b1bc4f62f 100644
--- a/packages/core-js/modules/es.weak-set.js
+++ b/packages/core-js/modules/es.weak-set.js
@@ -4,6 +4,6 @@ var collectionWeak = require('../internals/collection-weak');
 
 // `WeakSet` constructor
 // https://tc39.github.io/ecma262/#sec-weakset-constructor
-collection('WeakSet', function (get) {
-  return function WeakSet() { return get(this, arguments.length ? arguments[0] : undefined); };
-}, collectionWeak, false, true);
+collection('WeakSet', function (init) {
+  return function WeakSet() { return init(this, arguments.length ? arguments[0] : undefined); };
+}, collectionWeak);