diff --git a/CHANGELOG.md b/CHANGELOG.md
index dc2d69c17..c7f7e2e3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@
 **Note**: Gaps between patch versions are faulty/broken releases. **Note**: A feature tagged as Experimental is in a
 high state of flux, you're at risk of it changing without notice.
 
+# 1.0.1
+
+* **Bug Fix**
+  * fix `AnyType` by extending `Type<any>` (@gcanti)
+
 # 1.0.0
 
 * **Breaking Change**
diff --git a/package.json b/package.json
index 7d3d272c1..bdf37fb12 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "io-ts",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "TypeScript compatible runtime type system for IO validation",
   "files": ["lib"],
   "main": "lib/index.js",
diff --git a/src/index.ts b/src/index.ts
index a489278ab..47404b317 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -143,7 +143,7 @@ export class UndefinedType extends Type<undefined> {
 
 const undefinedType: UndefinedType = new UndefinedType()
 
-export class AnyType extends Type<any, any, any> {
+export class AnyType extends Type<any> {
   readonly _tag: 'AnyType' = 'AnyType'
   constructor() {
     super('any', (_): _ is any => true, success, identity)
diff --git a/typings-checker/index.ts b/typings-checker/index.ts
index 427e6a734..a2e876c40 100644
--- a/typings-checker/index.ts
+++ b/typings-checker/index.ts
@@ -360,3 +360,10 @@ export const Action = t.union([
 
 // ActionType: t.Type<"Action1" | "Action2", "Action1" | "Action2", t.mixed>
 const ActionType = pluck(Action, 'type')
+
+//
+// AnyType
+//
+
+declare const Any1: t.AnyType | t.InterfaceType<any>
+Any1.decode(1)