diff --git a/package-lock.json b/package-lock.json
index a420e36..fb02f82 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "react-model-view-viewmodel",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "react-model-view-viewmodel",
-      "version": "2.0.0",
+      "version": "2.0.1",
       "license": "MIT",
       "dependencies": {
         "react": ">=16.8"
diff --git a/package.json b/package.json
index 8129d07..d9aa4ce 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-model-view-viewmodel",
-  "version": "2.0.0",
+  "version": "2.0.1",
   "description": "A library for developing React applications using Model-View-ViewModel inspired by .NET",
   "main": "./lib/index.js",
   "types": "./lib/index.d.ts",
diff --git a/src/observable-collection.ts b/src/observable-collection.ts
index 44820a1..302c9c3 100644
--- a/src/observable-collection.ts
+++ b/src/observable-collection.ts
@@ -327,7 +327,7 @@ export class ReadOnlyObservableCollection<TItem> extends ViewModel implements IR
     public reduce<TResult>(callbackfn: (previousValue: TResult, currentItem: TItem, currentIndex: number, collection: IReadOnlyObservableCollection<TItem>) => TResult, initialValue: TResult): TResult;
     public reduce(callbackfn: any, initialValue?: any): any {
         const collection = this;
-        return this._items.reduce(function (previousValue, currentItem, currentIndex) { return callbackfn.call(previousValue, currentItem, currentIndex, collection); }, initialValue);
+        return this._items.reduce(function (this: any, previousValue, currentItem, currentIndex) { return callbackfn.call(this, previousValue, currentItem, currentIndex, collection); }, initialValue);
     }
 
     /**
@@ -348,7 +348,7 @@ export class ReadOnlyObservableCollection<TItem> extends ViewModel implements IR
     public reduceRight<TResult>(callbackfn: (previousValue: TResult, currentItem: TItem, currentIndex: number, collection: IReadOnlyObservableCollection<TItem>) => TResult, initialValue: TResult): TResult;
     public reduceRight(callbackfn: any, initialValue?: any): any {
         const collection = this;
-        return this._items.reduceRight(function (previousValue, currentItem, currentIndex) { return callbackfn.call(collection, previousValue, currentItem, currentIndex, collection); }, initialValue);
+        return this._items.reduceRight(function (this: any, previousValue, currentItem, currentIndex) { return callbackfn.call(this, collection, previousValue, currentItem, currentIndex, collection); }, initialValue);
     }
 
     /**
@@ -480,7 +480,7 @@ export class ReadOnlyObservableCollection<TItem> extends ViewModel implements IR
     public flatMap<TResult>(callback: (item: TItem, index: number, collection: any) => TResult | readonly TResult[], thisArg?: any): TResult[];
     public flatMap<TResult>(callback: (item: TItem, index: number, collection: any) => TResult | readonly TResult[], thisArg?: any): TResult[] {
         const collection = this;
-        return this._items.flatMap(function (item, index) { return callback.call(this, item, index, collection); }, thisArg);
+        return this._items.flatMap(function (this: any, item, index) { return callback.call(this, item, index, collection); }, thisArg);
     }
 
     /**