diff --git a/node/node-0.10.d.ts b/node/node-0.10.d.ts
index 9a8eac40e8..cf733eac2c 100644
--- a/node/node-0.10.d.ts
+++ b/node/node-0.10.d.ts
@@ -720,7 +720,7 @@ declare module "child_process" {
         env?: any;
         encoding?: string;
         timeout?: number;
-        maxBuffer?: string;
+        maxBuffer?: number;
         killSignal?: string;
     }, callback?: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function fork(modulePath: string, args?: string[], options?: {
diff --git a/node/node-0.11.d.ts b/node/node-0.11.d.ts
index e4bfa91dcb..db898e8510 100644
--- a/node/node-0.11.d.ts
+++ b/node/node-0.11.d.ts
@@ -639,7 +639,7 @@ declare module "child_process" {
         env?: any;
         encoding?: string;
         timeout?: number;
-        maxBuffer?: string;
+        maxBuffer?: number;
         killSignal?: string;
     }, callback: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function fork(modulePath: string, args?: string[], options?: {
diff --git a/node/node-0.8.8.d.ts b/node/node-0.8.8.d.ts
index 154025749e..1972e0cdcf 100644
--- a/node/node-0.8.8.d.ts
+++ b/node/node-0.8.8.d.ts
@@ -573,7 +573,7 @@ declare module "child_process" {
         env?: any;
         encoding?: string;
         timeout?: number;
-        maxBuffer?: string;
+        maxBuffer?: number;
         killSignal?: string;
     }, callback: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function fork(modulePath: string, args?: string[], options?: {
diff --git a/node/node.d.ts b/node/node.d.ts
index 13b579b59c..9448b413b1 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -860,7 +860,7 @@ declare module "child_process" {
         env?: any;
         encoding?: string;
         timeout?: number;
-        maxBuffer?: string;
+        maxBuffer?: number;
         killSignal?: string;
     }, callback?: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function fork(modulePath: string, args?: string[], options?: {