diff --git a/react/react-addons.d.ts b/react/react-addons.d.ts
index d9915e502..822f370b8 100644
--- a/react/react-addons.d.ts
+++ b/react/react-addons.d.ts
@@ -748,8 +748,8 @@ declare module "react/addons" {
     // ----------------------------------------------------------------------
 
     interface ReactChildren {
-        map<T>(children: ReactNode, fn: (child: ReactChild) => T): { [key:string]: T };
-        forEach(children: ReactNode, fn: (child: ReactChild) => any): void;
+        map<T>(children: ReactNode, fn: (child: ReactChild, index: number) => T): { [key:string]: T };
+        forEach(children: ReactNode, fn: (child: ReactChild, index: number) => any): void;
         count(children: ReactNode): number;
         only(children: ReactNode): ReactChild;
     }
diff --git a/react/react-global.d.ts b/react/react-global.d.ts
index f8b376355..d33d4268d 100644
--- a/react/react-global.d.ts
+++ b/react/react-global.d.ts
@@ -755,8 +755,8 @@ declare module React {
     // ----------------------------------------------------------------------
 
     interface ReactChildren {
-        map<T>(children: ReactNode, fn: (child: ReactChild) => T): { [key:string]: T };
-        forEach(children: ReactNode, fn: (child: ReactChild) => any): void;
+        map<T>(children: ReactNode, fn: (child: ReactChild, index: number) => T): { [key:string]: T };
+        forEach(children: ReactNode, fn: (child: ReactChild, index: number) => any): void;
         count(children: ReactNode): number;
         only(children: ReactNode): ReactChild;
     }
diff --git a/react/react.d.ts b/react/react.d.ts
index 218c6c94a..f2697fd25 100644
--- a/react/react.d.ts
+++ b/react/react.d.ts
@@ -755,8 +755,8 @@ declare module __React {
     // ----------------------------------------------------------------------
 
     interface ReactChildren {
-        map<T>(children: ReactNode, fn: (child: ReactChild) => T): { [key:string]: T };
-        forEach(children: ReactNode, fn: (child: ReactChild) => any): void;
+        map<T>(children: ReactNode, fn: (child: ReactChild, index: number) => T): { [key:string]: T };
+        forEach(children: ReactNode, fn: (child: ReactChild, index: number) => any): void;
         count(children: ReactNode): number;
         only(children: ReactNode): ReactChild;
     }