diff --git a/types/prop-types/index.d.ts b/types/prop-types/index.d.ts
index 4ff5f9faaa..86dc2d8b54 100644
--- a/types/prop-types/index.d.ts
+++ b/types/prop-types/index.d.ts
@@ -4,26 +4,29 @@
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
-type Validator<T> = (object: T, key: string, componentName: string, ...rest: any[]) => Error | null;
-
-interface Requireable<T> extends Validator<T> {
-    isRequired: Validator<T>;
+declare module 'prop-types' {
+    
+    type Validator<T> = (object: T, key: string, componentName: string, ...rest: any[]) => Error | null;
+    
+    interface Requireable<T> extends Validator<T> {
+        isRequired: Validator<T>;
+    }
+    
+    type ValidationMap<T> = {[K in keyof T]?: Validator<T> };
+    
+    var any: Requireable<any>;
+    var array: Requireable<any>;
+    var bool: Requireable<any>;
+    var func: Requireable<any>;
+    var number: Requireable<any>;
+    var object: Requireable<any>;
+    var string: Requireable<any>;
+    var node: Requireable<any>;
+    var element: Requireable<any>;
+    function instanceOf(expectedClass: {}): Requireable<any>;
+    function oneOf(types: any[]): Requireable<any>;
+    function oneOfType(types: Array<Validator<any>>): Requireable<any>;
+    function arrayOf(type: Validator<any>): Requireable<any>;
+    function objectOf(type: Validator<any>): Requireable<any>;
+    function shape(type: ValidationMap<any>): Requireable<any>;
 }
-
-type ValidationMap<T> = {[K in keyof T]?: Validator<T> };
-
-declare var any: Requireable<any>;
-declare var array: Requireable<any>;
-declare var bool: Requireable<any>;
-declare var func: Requireable<any>;
-declare var number: Requireable<any>;
-declare var object: Requireable<any>;
-declare var string: Requireable<any>;
-declare var node: Requireable<any>;
-declare var element: Requireable<any>;
-declare function instanceOf(expectedClass: {}): Requireable<any>;
-declare function oneOf(types: any[]): Requireable<any>;
-declare function oneOfType(types: Array<Validator<any>>): Requireable<any>;
-declare function arrayOf(type: Validator<any>): Requireable<any>;
-declare function objectOf(type: Validator<any>): Requireable<any>;
-declare function shape(type: ValidationMap<any>): Requireable<any>;