diff --git a/lib/node.js b/lib/node.js
index 29e2fcba4f8..70d848934b9 100644
--- a/lib/node.js
+++ b/lib/node.js
@@ -142,7 +142,7 @@ type child_process$execCallback = (error: ?child_process$Error, stdout: string |
 type child_process$execSyncOpts = {
   cwd?: string;
   input?: string | Buffer;
-  stdio?: Array<any>;
+  stdio?: string | Array<any>;
   env?: Object;
   shell?: string,
   uid?: number;
@@ -169,7 +169,7 @@ type child_process$execFileCallback = (error: ?child_process$Error, stdout: Buff
 type child_process$execFileSyncOpts = {
   cwd?: string;
   input?: string | Buffer;
-  stdio?: Array<any>;
+  stdio?: string | Array<any>;
   env?: Object;
   uid?: number;
   gid?: number;
@@ -216,7 +216,7 @@ type child_process$spawnRet = {
 type child_process$spawnSyncOpts = {
   cwd?: string;
   input?: string | Buffer;
-  stdio?: Array<any>;
+  stdio?: string | Array<any>;
   env?: Object;
   uid?: number;
   gid?: number;
diff --git a/tests/node_tests/child_process/execSync.js b/tests/node_tests/child_process/execSync.js
index 6fef2c035aa..171fd174883 100644
--- a/tests/node_tests/child_process/execSync.js
+++ b/tests/node_tests/child_process/execSync.js
@@ -6,3 +6,5 @@ var execSync = require('child_process').execSync;
 (execSync('ls', {encoding: 'buffer'}): Buffer); // returns Buffer
 (execSync('ls', {encoding: 'utf8'}): string); // returns string
 (execSync('ls', {timeout: '250'})); // error, no signatures match
+(execSync('ls', {stdio: 'inherit'})); // error, no signatures match
+(execSync('ls', {stdio: ['inherit']})); // error, no signatures match